Battle of Greece The Battle of Greece ( also known as Operation Marita , ) is the common name for the invasion of Greece by Nazi Germany in April 1941 . It followed a previous , unsuccessful Italian invasion known as the Greco - Italian War . It is usually distinguished from the Battle of Crete that came after mainland Greece had been subdued . These operations were part of the greater Balkans Campaign of Nazi Germany in World War II . At the time of the German invasion , Greece was already at war with Italy , following the Italian invasion on 28 October 1940 . Greece successfully defeated the initial attack and the counterattack of March 1941 . When Operation Marita began on 6 April , the bulk of the Greek army was on the Albanian border , from which the Italians were trying to enter Greece . German troops invaded through Bulgaria , creating a second front . Greece had already received a small reinforcement from British Empire forces in anticipation of the German attack but no more help was sent after the invasion began . The Greek army found itself vastly outnumbered in its effort to defend against both Italian and German troops . As a result , the Bulgarian defensive line did not receive adequate troop reinforcements and was quickly overrun by the Germans who then outflanked the Greek forces in the Albanian borders , forcing their surrender . The British Empire forces then performed a tactical retreat with an ultimate goal of evacuation . The German army reached the city of Athens on 27 April and Greece ' s southern shore on April 30 , capturing 7 , 000 British Empire forces , and ending the battle to their complete victory . The conquest of Greece was completed with the capture of Crete a month later . Following its conquest , Greece was occupied by military forces of Germany , Italy , and Bulgaria . Looking back near the end of the war , as Germany ' s inevitable and impending defeat loomed ever closer , Hitler attributed great blame to Mussolini ' s Greek fiasco as the cause of his own subsequent catastrophe . As an explanation of Germany ' s calamitous defeat in the Soviet Union , this had little to commend it . It nevertheless had serious consequences for the Axis war effort in north Africa . Background . Greco - Italian War . At the outbreak of World War II , Ioannis Metaxas — then fascist dictator of Greece and former General — sought to maintain a position of neutrality . However , Greece was subject to increasing pressure from Italy , culminating when the Italian submarine " Delfino " sunk the cruiser on 15 August 1940 . Italian leader Benito Mussolini was irritated that Nazi leader Adolf Hitler had not consulted him on his war policy and wished to establish his independence . He hoped to match the Germans ' military success by taking Greece , which he regarded as an easy opponent . On 15 October 1940 , Mussolini and his closest advisers finalised their decision . In the early hours of 28 October , Italian Ambassador Emanuele Grazzi presented Metaxas with a three - hour ultimatum , demanding free passage for troops to occupy unspecified " strategic sites " within Greek territory . Metaxas rejected the ultimatum ( the refusal is commemorated as Greek national holiday Ohi Day ) , but even before its expiration , Italian troops had invaded Greece through Albania . The principal Italian thrust was directed toward Epirus . The first conflict with the Greek army was at the Battle of Elaia - Kalamas , where they failed to break the defensive line and were forced to halt . Within three weeks , the Greek army launched a successful counterattack during which it marched into Albanian territory , capturing significant cities such as Korytsa and Agioi Saranta . Neither a change in Italian commandment nor the arrival of substantial reinforcements improved the position of the Italian army . After weeks of inconclusive winter warfare , the Italians launched a large - scale counterattack across the center of the front on 9 March 1941 , which failed , despite the Italian ' s superior force . After one week and 12 , 000 casualties , Mussolini called off the counterattack and left Albania twelve days later . Modern analysts believe that the Italian campaign failed because Mussolini and his generals initially allocated insufficient resources to the campaign ( an expeditionary force of 55 , 000 men ) , failed to reckon with the autumn weather , attacked without the advantage of surprise and without Bulgarian support . Elementary precautions such as issuing winter clothing had not been taken . Nor had Mussolini considered the warnings of the Italian Commission of War Production that Italy would not be able to sustain a full year of continuous warfare until 1949 . During the six - month fight against Italy , the Hellenic army made territorial gains by eliminating Italian salient s . Nevertheless , Greece did not have a substantial armaments industry and both its equipment and ammunition supplies increasingly relied on stocks captured by British forces from defeated Italian armies in North Africa . In order to man the Albanian battlefront , the Greek command was forced to withdraw forces from Eastern Macedonia and Western Thrace . Available Greek forces could not protect Greece ' s entire border . The Greek command decided to support its success in Albania , regardless of the risk of a German attack from the Bulgarian border . Hitler ' s decision to attack and British aid to Greece . Hitler intervened on 4 November 1940 , four days after British troops arrived at Crete and Lemnos . British forces in ( before the Italian attack neutral ) Greece meant a significant challenge since they could have tried to establish a frontier to the German southern flank . The " Führer " ordered his Army General Staff to attack Northern Greece from bases in Romania and Bulgaria in support of his master plan to deprive the British of Mediterranean bases . On November 12 , the German Armed Forces High Command issued Directive No . 18 , in which they scheduled simultaneous operations against Gibraltar and Greece for the following January . However , in December 1940 , German ambition in the Mediterranean underwent considerable revision when Spain ' s General Francisco Franco rejected the Gibraltar attack . Consequently , Germany ' s offensive in Southern Europe was restricted to the Greek campaign . The Armed Forces High Command issued Directive No . 20 on 13 December 1940 , outlining the Greek campaign under the code designation " Operation Marita " . The plan was to occupy the northern coast of the Aegean Sea by March 1941 and to seize the entire Greek mainland , if necessary . During a hasty meeting of Hitler ' s staff after the unexpected 27 March " coup d ' état " against the Yugoslav government , orders for the future campaign in Yugoslavia were drafted , as well as changes to the plans for Greece . On 6 April , both Greece and Yugoslavia were to be attacked . Britain was obliged to assist Greece by the Declaration of 1939 , which stated that in the event of a threat to Greek or Romanian independence , " His Majesty ' s Government would feel themselves bound at once to lend the Greek or Romanian Government . . . all the support in their power . " The first British effort was the deployment of Royal Air Force ( RAF ) squadrons commanded by Air Commodore John d ' Albiac that arrived in November 1940 . With Greek government consent , British forces were dispatched to Crete on October 31 to guard Suda Bay , enabling the Greek government to redeploy the 5th Cretan Division to the mainland . On 17 November 1940 , Metaxas proposed a joint offensive in the Balkans to the British government , with Greek strongholds in southern Albania as the operational base . The British were reluctant to discuss Metaxas ' proposal , because the troops necessary for implementing the Greek plan would seriously endanger operations in North Africa . During a meeting of British and Greek military and political leaders in Athens on 13 January 1941 , General Alexandros Papagos — Commander - in - Chief of the Hellenic Army — asked Britain for nine fully equipped divisions and corresponding air support . The British responded that all they could offer was the immediate dispatch of a token force of less than divisional strength . This offer was rejected by the Greeks who feared that the arrival of such a contingent would precipitate a German attack without giving them meaningful assistance . British help would be requested if and when German troops crossed the Danube from Romania into Bulgaria . British expeditionary force . Little more than a month later , the British reconsidered . Winston Churchill aspired to recreate a Balkan Front comprising Yugoslavia , Greece and Turkey , and instructed Anthony Eden and Sir John Dill to resume negotiations with the Greek government . A meeting attended by Eden and the Greek leadership , including King George II , Prime Minister Alexandros Koryzis — the successor of Metaxas , who had died on 29 January 1941 — and Papagos took place in Athens on 22 February , where they decided to send a British Empire expeditionary force . German troops had been massing in Romania and on 1 March , " Wehrmacht " forces began to move into Bulgaria . At the same time , the Bulgarian Army mobilised and took up positions along the Greek frontier . On 2 March , Operation Lustre — the transportation of troops and equipment to Greece — began and 26 troopship s arrived at the port of Piraeus . On 3 April , during a meeting of British , Yugoslav and Greek military representatives , the Yugoslavs promised to block the Struma river valley in case of a German attack across their territory . During this meeting , Papagos stressed the importance of a joint Greco - Yugoslavian offensive against the Italians , as soon as the Germans launched their offensive . By 24 April more than 62 , 000 Empire troops ( British , Australians , New Zealanders , Palestinians and Cypriots ) , had arrived in Greece , comprising the 6th Australian Division , the New Zealand 2nd Division and the British 1st Armoured Brigade . The three formations later became known as ' W ' Force , after their commander , Lieutenant - General Sir Henry Maitland Wilson . Air Commodore Sir John D ' Albiac commanded British air forces in Greece . Prelude . Topography . To enter Northern Greece , the German army had to cross the Rhodope mountains , which offered few river valleys or mountain pass es capable of accommodating the movement of large military units . Two invasion courses were located west of Kyustendil ; another was along the Yugoslav - Bulgarian border , via the Struma river valley to the south . Greek border fortifications had been adapted for the terrain and a formidable defence system covered the few available roads . The Struma and Nestos rivers cut across the mountain range along the Greek - Bulgarian frontier and both of their valleys were protected by strong fortifications , as part of the larger Metaxas Line . This system of concrete pillbox es and field fortifications , constructed along the Bulgarian border in the late 1930s , was built on principles similar to those of the Maginot Line . Its strength resided mainly in the inaccessibility of the intermediate terrain leading up to the defence positions . Strategic factors . Greece ' s mountainous terrain favored a defensive strategy and the high ranges of the Rhodope , Epirus , Pindus and Olympus mountains offered many defensive opportunities . However , air power was required to protect defending ground forces from entrapment in the many defile s . Although an invading force from Albania could be stopped by a relatively small number of troops positioned in the high Pindus mountains , the northeastern part of the country was difficult to defend against an attack from the north . Following a March conference in Athens , the British believed that they would combine with Greek forces to occupy the Haliacmon Line — a short front facing northeastward along the Vermion Mountains and the lower Haliacmon river . Papagos awaited clarification from the Yugoslav government and later proposed to hold the Metaxas Line — by then a symbol of national security to the Greek populace — and not withdraw divisions from Albania . He argued that to do so would be seen as a concession to the Italians . The strategically important port of Thessaloniki lay practically undefended and transportation of British troops to the city remained dangerous . Papagos proposed to take advantage of the area ' s terrain and prepare fortifications , while also protecting Thessaloniki . General Dill described Papagos ' attitude as " unaccommodating and defeatist " , and argued that his plan ignored the fact that Greek troops and artillery were capable of only token resistance . The British believed that the Greek rivalry with Bulgaria — the Metaxas Line was designed specifically for war with Bulgaria — as well as their traditionally good terms with the Yugoslavs — left their north - western border largely undefended . Despite their awareness that the line was likely to collapse in the event of a German thrust from the Struma and Axios rivers , the British eventually acceded to the Greek command . On 4 March , Dill accepted the plans for the Metaxas line and on 7 March agreement was ratified by the British Cabinet . The overall command was to be retained by Papagos and the Greek and British commands agreed to fight a delaying action in the northeast . Nevertheless , the British did not move their troops , because General Wilson regarded them as too weak to protect such a broad front . Instead , he took a position some west of the Axios , across the Haliacmon Line . The two main objectives in establishing this position were to maintain contact with the Hellenic army in Albania and to deny German access to Central Greece . This had the advantage of requiring a smaller force than other options , while allowing more preparation time . However , it meant abandoning nearly the whole of Northern Greece , which was unacceptable to the Greeks for political and psychological reasons . Moreover , the line ' s left flank was susceptible to flanking from Germans operating through the Monastir gap in Yugoslavia . However , the rapid disintegration of the Yugoslav Army and a German thrust into the rear of the Vermion position was not expected . The German strategy was based on utilisation of so - called " " blitzkrieg " " methods that had proved successful during the invasions of Western Europe . Their effectiveness was confirmed during the invasion of Yugoslavia . The German command again coupled ground troops and armour with air support and rapidly drove into the territory . Once Thessaloniki was captured , Athens and the port of Piraeus became principal targets . The loss of Piraeus and the Isthmus of Corinth would fatally compromise withdrawal and evacuation of British and Greek forces . Defence and attack forces . The Fifth Yugoslav Army took responsibility for the southeastern border between Kriva Palanka and the Greek border . However , the Yugoslav troops were not fully mobilised and lacked adequate equipment and weapons . Following the entry of German forces into Bulgaria , the majority of Greek troops were evacuated from Western Thrace . By this time , Greek forces defending the Bulgarian border totaled roughly 70 , 000 men ( sometimes labeled the " Greek Second Army " in English and German sources , although no such formation existed ) . The remainder of the Greek forces — 14 divisions ( often erroneously referred to as the " Greek First Army " by foreign sources ) — was committed in Albania . On 28 March , 28 Greek forces in Central Macedonia — the 12th and 20th Infantry Divisions — were put under the command of General Wilson , who established his headquarters northwest of Larissa . The New Zealand division took position north of Mount Olympus , while the Australian division blocked the Haliacmon valley up to the Vermion range . The RAF continued to operate from airfields in Central and Southern Greece ; however , few planes could be diverted to the theater . The British forces were near to fully motorised , but their equipment was more suited to desert warfare than to Greece ' s steep mountain roads . They were short of tanks and anti - aircraft gun s and the lines of communication across the Mediterranean were vulnerable , because each convoy had to pass close to Axis - held islands in the Aegean ; despite the British Royal Navy ' s domination of the Aegean Sea . These logistical problems were aggravated by the limited availability of shipping and Greek port capacity . The German Twelfth Army — under the command of Field Marshal Wilhelm List — was charged with the execution of Operation Marita . His army was composed of six units : German plan of attack and assembly . The German plan of attack was influenced by their army ' s experiences during the Battle of France . Their strategy was to create a diversion through the campaign in Albania , thus stripping the Hellenic Army of manpower for the defence of their Yugoslavian and Bulgarian borders . By driving armoured wedges through the weakest links of the defence chain , penetrating Allied territory would not require substantial armour behind an infantry advance . Once Southern Yugoslavia was overrun by German armour , the Metaxas Line could be outflanked by highly mobile forces thrusting southward from Yugoslavia . Thus possession of Monastir and the Axios valley leading to Thessaloniki became essential for such an outflanking maneuver . The Yugoslav " coup d ' état " led to a sudden change in the plan of attack and confronted the Twelfth Army with a number of difficult problems . According to the 28 March Directive No . 25 , the Twelfth Army was to create a mobile task force to attack via Niš toward Belgrade . With only nine days left before their final deployment , every hour became valuable and each fresh assembly of troops took time to mobilise . By the evening of 5 April , the forces intended to enter southern Yugoslavia and Greece had been assembled . German invasion . Thrust across Southern Yugoslavia and the drive to Thessaloniki . At dawn on 6 April , the German armies invaded Greece , while the " Luftwaffe " began an intensive bombardment of Belgrade . The XL " Panzer " Corps — planned to attack across southern Yugoslavia — began their assault at 05 : 30 . They pushed across the Bulgarian frontier at two separate points . By the evening of 8 April , the 73rd Infantry Division captured Prilep , severing an important rail line between Belgrade and Thessaloniki and isolating Yugoslavia from its allies . On the evening of 9 April , Stumme deployed his forces north of Monastir , in preparation for attack toward Florina . This position threatened to encircle the Greeks in Albania and W Force in the area of Florina , Edessa and Katerini . While weak security detachments covered his rear against a surprise attack from central Yugoslavia , elements of the 9th " Panzerdivision " drove westward to link up with the Italians at the Albanian border . The 2nd " Panzerdivision " ( XVIII Mountain Corps ) entered Yugoslavia from the east on the morning of 6 April and advanced westward through the Struma Valley . It encountered little resistance , but was delayed by road clearance demolitions , mine s and mud . Nevertheless , the division was able to reach the day ' s objective , the town of Strumica . On 7 April , a Yugoslav counterattack against the division ' s northern flank was repelled and the following day the division forced its way across the mountains and overran the Greek 19th Motorised Infantry Division Units stationed south of Doiran lake . Despite many delays along the mountain roads , an armoured advance guard dispatched toward Thessaloniki succeeded in entering the city by the morning of 9 April . Thessaloniki ' s capture took place without a struggle and was followed by the surrender of the Greek East Macedonia Army Section , taking effect at 13 : 00 on April 10 . Metaxas Line . The Metaxas Line was defended by the Eastern Macedonia Army Section , which comprised the 7th , 14th and 18th Infantry Divisions under the command of Lieutenant General Konstantinos Bakopoulos . The line ran for about along the river Nestos to the east and then further east , following the Bulgarian border as far as Mount Beles near the Yugoslav border . The fortifications were designed to garrison over 200 , 000 troops , but the actual number was roughly 70 , 000 . As a result the line ' s defences were thinly spread . The Germans had to break the line to capture Thessaloniki , Northern Greece ' s biggest city , with a strategic port . The attack started on 6 April with one infantry unit and two divisions of the XVIII Mountain Corps . Due to strong resistance , the first day of the attack yielded little progress in breaking the line . A German report at the end of the first day described how the German 5th Mountain Division " was repulsed in the Rupel Pass despite strongest air support and sustained considerable casualties " . Of the 24 forts that made up the Metaxas Line , only two had fallen and then only after they had been destroyed . In the following days , the Germans pummeled the forts with artillery and dive bomber s and reinforced the 125th Infantry Regiment . A snow - covered mountainous passage considered inaccessible by the Greeks was successfully crossed by the 6th Mountain Division , which reached the rail line to Thessaloniki on the evening of 7 April . The 5th Mountain Division , together with the reinforced 125th Infantry Regiment , penetrated across the Struma river under great hardship , attacking along both banks and clearing bunkers until they reached their objective location on 7 April . Heavy casualties caused them to temporarily withdraw . The 72nd Infantry Division advanced from Nevrokop across the mountains . Its advance was delayed by a shortage of pack animals , medium artillery and mountain equipment . Only on the evening of 9 April did it reach the area northeast of Serres . Most fortresses — like Rupel , Echinos , Arpalouki , Paliouriones , Perithori , Karadag , Lisse and Istibey — held until the Germans occupied Thessaloniki on 9 April , at which point they surrendered under General Bakopoulos ' orders . Nevertheless , minor isolated fortresses continued to fight for a few days more and were not taken until heavy artillery was used against them . This gave time for some retreating troops to evacuate by sea . Although eventually broken , the Metaxas Line proved much stronger than expected , inflicting significant damage to the German force . Capitulation of the Hellenic army in Macedonia . The XXX Infantry Corps on the left wing reached its designated objective on the evening of 8 April , when the 164th Infantry Division captured Xanthi . The 50th Infantry Division advanced far beyond Komotini towards the Nestos river . Both divisions arrived the next day . On 9 April , the Greek forces defending the Metaxas Line capitulated unconditionally following the collapse of Greek resistance east of the Axios river . In a 9 April estimate of the situation , Field Marshal List commented that as a result of the swift advance of the mobile units , his 12th Army was now in a favorable position to access central Greece by breaking the Greek buildup behind the Axios river . On the basis of this estimate , List requested the transfer of the 5th Panzer Division from First " Panzer " Group to the XL " Panzer " Corps . He reasoned that its presence would give additional punch to the German thrust through the Monastir gap . For the continuation of the campaign , he formed an eastern group under the command of XVIII Mountain Corps and a western group led by XL " Panzer " Corps . Breakthrough to Kozani . By the morning of 10 April , the XL " Panzer " Corps had finished its preparations for the continuation of the offensive and advanced in the direction of Kozani . Against all expectations , the Monastir gap had been left open and the Germans exploited the error . First contact with Allied troops was made north of Vevi at 11 : 00 on 10 April . German SS troops seized Vevi on 11 April , but were stopped at the Klidi Pass just south of town , where a mixed Empire - Greek formation — known as Mackay Force — was assembled to , as Wilson put it , " . . . stop a " blitzkrieg " down the Florina valley . " During the next day , the SS regiment reconnoitered the Allied positions and at dusk launched a frontal attack against the pass . Following heavy fighting , the Germans broke through the defence . By the morning of 14 April , the spearheads of the 9th Panzer Division reached Kozani . Olympus and Servia passes . Wilson faced the prospect of being pinned by Germans operating from Thessaloniki , while being flanked by the German XL " Panzer " Corps descending through the Monastir Gap . On 13 April , he withdrew all British forces to the Haliacmon river and then to the narrow pass at Thermopylae . On 14 April , the 9th " Panzerdivision " established a bridgehead across the Haliacmon river , but an attempt to advance beyond this point was stopped by intense Allied fire . This defence had three main components : the Platamon tunnel area between Olympus and the sea , the Olympus pass itself and the Servia pass to the southeast . By channeling the attack through these three defile s , the new line offered far greater defensive strength . The defences of the Olympus and Servia passes consisted of the 4th New Zealand Brigade , 5th New Zealand Brigade and the 16th Australian Brigade . For the next three days , the advance of the 9th Panzer Division was stalled in front of these resolutely held positions . A ruined castle dominated the ridge across which the coastal pass led to Platamon . During the night of April 15 , a German motorcycle battalion supported by a tank battalion attacked the ridge , but the Germans were repulsed by the 21st New Zealand Battalion under Colonel Macky , which suffered heavy losses in the process . Later that day , a German armoured regiment arrived and struck the coastal and inland flanks of the battalion , but the New Zealanders held . After being reinforced during the night of the 15th – 16th , the Germans assembled a tank battalion , an infantry battalion and a motorcycle battalion . The infantry attacked the New Zealanders ' left company at dawn , while the tanks attacked along the coast several hours later . The New Zealand battalion withdrew , crossing the Pineios river ; by dusk , they had reached the western exit of the Pineios Gorge , suffering only light casualties . Macky was informed that it was " essential to deny the gorge to the enemy until 19 April even if it meant extinction " . He sank a crossing barge at the western end of the gorge once all his men were across and set up defences . The 21st battalion was reinforced by the Australian 2 / 2nd Battalion and later by the 2 / 3rd . This force became known as " Allen force " after Brigadier " Tubby " Allen . The 2 / 5th and 2 / 11th battalions moved to the Elatia area south - west of the gorge and were ordered to hold the western exit possibly for three or four days . On 16 April , Wilson met Papagos at Lamia and informed him of his decision to withdraw to Thermopylae . General Blamey divided responsibility between generals Mackay and Freyberg during the leapfrogging move to Thermopylae . Mackay ' s force was assigned the flanks of the New Zealand Division as far south as an east - west line through Larissa and to oversee the withdrawal through Domokos to Thermopylae of the Savige and Zarkos Forces and finally of Lee Force ; Freyberg ' s 1st Armoured Brigade was to cover the withdrawal of Savige Force to Larissa and thereafter the withdrawal of the 6th Division under whose command it would come ; overseeing the withdrawal of Allen Force which was to move along the same route as the New Zealand Division . The British Empire forces remained under attack throughout the withdrawal . On the morning of 18 April , the struggle for the Pineios gorge aka Battle of Tempe Gorge was over , when German armoured infantry crossed the river on floats and 6th Mountain Division troops worked their way around the New Zealand battalion , which was subsequently dispersed . On 19 April , the first XVIII Mountain Corps troops entered Larissa and took possession of the airfield , where the British had left their supply dump intact . The seizure of ten truckloads of rations and fuel enabled the spearhead units to continue without ceasing . The port of Volos , at which the British had re - embarked numerous units during the prior few days , fell on 21 April ; there , the Germans captured large quantities of valuable diesel and crude oil . Withdrawal and surrender of the Greek Epirus Army . As the invading Germans advanced deep into Greek territory , the Hellenic Army Section of Epirus ( ΤΣΗ ) operating in Albania was reluctant to retreat . General Wilson described this unwillingness as " the fetishistic doctrine that not a yard of ground should be yielded to the Italians . " It was not until 13 April that the first Greek elements began to withdraw toward the Pindus mountains . The Allies ' retreat to Thermopylae uncovered a route across the Pindus mountains by which the Germans might flank the Hellenic army in a rearguard action . An elite SS formation — the " Leibstandarte SS Adolf Hitler " brigade — was assigned the mission of cutting off the Greek Epirus Army ' s line of retreat from Albania by driving westward to the Metsovon pass and from there to Ioannina . On 14 April , heavy fighting took place at Kleisoura pass , where the Germans blocked the Greek withdrawal . The withdrawal extended across the entire Albanian front , with the Italians in hesitant pursuit . General Papagos rushed Greek units to the Metsovon pass where the Germans were expected to attack . On 18 April a pitched battle between several Greek units and the LSSAH brigade — which had by then reached Grevena — erupted . The Greek units lacked the equipment necessary to fight against a motorised unit and were soon encircled and overwhelmed . The Germans advanced further and on 19 April captured Ioannina , the final supply route of the Greek Epirus Army . Allied newspapers dubbed the Hellenic army ' s fate a modern day Greek tragedy . Historian and former war - correspondent Christopher Buckley — when describing the fate of the Hellenic army — stated that " one experience [ d ] a genuine Aristotelian catharsis , an awe - inspiring sense of the futility of all human effort and all human courage . " On 20 April , the commander of Greek forces in Albania — General Georgios Tsolakoglou — accepted the hopelessness of the situation and offered to surrender his army , which then consisted of fourteen divisions . Historian John Keegan writes that Tsolakoglou " was so determined . . . to deny the Italians the satisfaction of a victory they had not earned that . . . he opened [ a ] quite unauthorised parley with the commander of the German SS division opposite him , Sepp Dietrich , to arrange a surrender to the Germans alone . " On strict orders from Hitler , negotiations were kept secret from the Italians and the surrender was accepted . Outraged by this decision , Mussolini ordered counterattacks against the Greek forces , which were repulsed . It took a personal representation from Mussolini to Hitler to organize Italian participation in the armistice that was concluded on 23 April . Greek soldiers were not rounded up as prisoners of war and were allowed instead to go home after the demobilisation of their units , while their officers were permitted to retain their side arms . Thermopylae position . As early as 16 April , the German command realised that the British were evacuating troops on ships at Volos and Piraeus . The campaign then took on the character of a pursuit . For the Germans , it was now primarily a question of maintaining contact with the retreating British forces and foiling their evacuation plans . German infantry divisions were withdrawn due to its limited mobility . The 2nd and 5th " Panzerdivisions " , the 1st SS Motorised Infantry Regiment and both mountain divisions launched a pursuit of the Allied forces . To allow an evacuation of the main body of British forces , Wilson ordered the rearguard to make a last stand at the historic Thermopylae pass , the gateway to Athens . General Freyberg was given the task of defending the coastal pass , while Mackay was to hold the village of Brallos . After the battle Mackay was quoted as saying " I did not dream of evacuation ; I thought that we ' d hang on for about a fortnight and be beaten by weight of numbers . " When the order to retreat was received on the morning of 23 April , it was decided that the two positions were to be held by one brigade each . These brigades , the 19th Australian and 6th New Zealand were to hold the passes as long as possible , allowing the other units to withdraw . The Germans attacked at 11 : 30 on 24 April , met fierce resistance , lost 15 tanks and sustained considerable casualties . The Allies held out the entire day ; with the delaying action accomplished , they retreated in the direction of the evacuation beaches and set up another rearguard at Thebes The " Panzer " units launching a pursuit along the road leading across the pass made slow progress because of the steep gradient and difficult hairpin bends . German drive on Athens . After abandoning the Thermopylae area , the British rearguard withdrew to an improvised switch position south of Thebes , where they erected a last obstacle in front of Athens . The motorcycle battalion of the 2nd " Panzerdivision " , which had crossed to the island of Euboea to seize the port of Chalcis and had subsequently returned to the mainland , was given the mission of outflanking the British rearguard . The motorcycle troops encountered only slight resistance and on the morning of 27 April 1941 , the first Germans entered Athens , followed by armoured cars , tank s and infantry . They captured intact large quantities of POL ( petroleum , oil and lubricants ) several thousand tons of ammunition , ten trucks loaded with sugar and ten truckloads of other rations in addition to various other equipment , weapons and medical supplies . The people of Athens had been expecting the Germans for several days and confined themselves to their homes with their windows shut . The previous night , Athens Radio had made the following announcement : " You are listening to the voice of Greece . Greeks , stand firm , proud and dignified . You must prove yourselves worthy of your history . The valor and victory of our army has already been recognised . The righteousness of our cause will also be recognised . We did our duty honestly . Friends ! Have Greece in your hearts , live inspired with the fire of her latest triumph and the glory of our army . Greece will live again and will be great , because she fought honestly for a just cause and for freedom . Brothers ! Have courage and patience . Be stouthearted . We will overcome these hardships . Greeks ! With Greece in your minds you must be proud and dignified . We have been an honest nation and brave soldiers . " The Germans drove straight to the Acropolis and raised the Nazi flag . According to the most popular account of the events , the Evzone soldier on guard duty , Konstantinos Koukidis , took down the Greek flag , refusing to hand it to the invaders wrapped himself in it and jumped off the Acropolis . Whether the story was true or not , many Greeks believed it and viewed the soldier as a martyr . Evacuation of Empire forces . General Archibald Wavell , the commander of British Army forces in the Middle East , when in Greece from 11 – 13 April had warned Wilson that he must expect no reinforcements and had authorised Major General Freddie de Guingand to discuss evacuation plans with certain responsible officers . Nevertheless , the British could not at this stage adopt or even mention this course of action ; the suggestion had to come from the Greek Government . The following day , Papagos made the first move when he suggested to Wilson that W Force be withdrawn . Wilson informed Middle East Headquarters and on 17 April , Rear admiral H . T . Baillie - Grohman was sent to Greece to prepare for the evacuation . That day Wilson hastened to Athens where he attended a conference with the King , Papagos , d ' Albiac and Rear admiral Turle . In the evening , after telling the King that he felt he had failed him in the task entrusted to him , Koryzis committed suicide . On 21 April , the final decision to evacuate Empire forces to Crete and Egypt was taken and Wavell — in confirmation of verbal instructions — sent his written orders to Wilson . 5 , 200 men , mostly from the 5th New Zealand Brigade , were evacuated on the night of 24 April , from Porto Rafti of East Attica , while the 4th New Zealand Brigade remained to block the narrow road to Athens , dubbed the " 24 Hour Pass " by the New Zealanders . On 25 April ( Anzac Day ) , the few RAF squadrons left Greece ( d ' Albiac established his headquarters in Heraklion , Crete ) and some 10 , 200 Australian troops evacuated from Nauplion and Megara . 2 , 000 more men had to wait until 27 April , because " Ulster Prince " ran aground in shallow waters close to Nauplion . Because of this event , the Germans realised that the evacuation was also taking place from the ports of East Peloponnese . On 25 April , the Germans staged an airborne operation to seize the bridges over the Corinth canal , with the double aim of cutting off the British line of retreat and securing their own way across the isthmus . The attack met with initial success , until a stray British shell destroyed the bridge . The 1st SS Motorised Infantry Regiment ( LSSAH ) , assembled at Ioannina , thrust along the western foothills of the Pindus Mountains via Arta to Missolonghi and crossed over to the Peloponnese at Patras in an effort to gain access to the isthmus from the west . Upon their arrival at 17 : 30 on 27 April , the SS forces learned that the paratroops had already been relieved by Army units advancing from Athens . The Dutch passenger ship DSS Slamat which had been converted into a troopship , was on its way to Greece to pick up 60 , 000 allied troops as part of Operation Demon and was sunk on 27 April 1941 following severe German attacks from nine Junkers Ju 87 s of the Jagdgeschwader 77 once it departed Greece with the troops and went south . It contained 600 allied troops and 214 crew , only 11 of which survived . The erection of a temporary bridge across the Corinth canal permitted 5th " Panzerdivision " units to pursue the Allied forces across the Peloponnese . Driving via Argos to Kalamata , from where most Allied units had already begun to evacuate , they reached the south coast on 29 April , where they were joined by SS troops arriving from Pyrgos . The fighting on the Peloponnese consisted of small - scale engagements with isolated groups of British troops who had been unable to reach the evacuation point . The attack came days too late to cut off the bulk of the British troops in Central Greece , but isolated the Australian 16th and 17th Brigades . By 30 April the evacuation of about 50 , 000 soldiers was completed , but was heavily contested by the German " Luftwaffe " , which sank at least 26 troop - laden ships . The Germans captured around 8 , 000 Empire ( including 2 , 000 Cypriot and Palestinian ) and Yugoslav troops in Kalamata who had not been evacuated , while liberating many Italian prisoners from POW camps . Aftermath . Triple occupation . On 13 April 1941 , Hitler issued Directive No . 27 , including his occupation policy for Greece . He finalised jurisdiction in the Balkans with Directive No . 31 issued on 9 June . Mainland Greece was divided between Germany , Italy and Bulgaria . German forces occupied the strategically more important areas , namely Athens , Thessaloniki , Central Macedonia and several Aegean islands , including most of Crete . They also occupied Florina , which was claimed by both Italy and Bulgaria . Bulgaria , which had not participated in the invasion of Greece , occupied most of Thrace on the same day that Tsolakoglou offered his surrender . The goal was to gain an Aegean Sea outlet in Western Thrace and Eastern Macedonia . The Bulgarians occupied territory between the Struma river and a line of demarcation running through Alexandroupoli and Svilengrad west of the Evros river . The remainder of Greece was left to Italy . Italian troops started occupying the Ionian and Aegean islands on 28 April . On 2 June , they occupied the Peloponnese ; on 8 June , Thessaly ; and on 12 June , most of Attica . The occupation of Greece — during which civilians suffered terrible hardships , many dying from privation and hunger — proved to be a difficult and costly task . Several resistance group s launched guerilla attacks against the occupying forces and set up espionage networks . Battle of Crete . On 25 April 1941 , King George II and his government left the Greek mainland for Crete , which was attacked by Nazi forces on 20 May 1941 . The Germans employed parachute forces in a massive airborne invasion and attacked the three main airfields of the island in Maleme , Rethymno and Heraklion . After seven days of fighting and tough resistance , Allied commanders decided that the cause was hopeless and ordered a withdrawal from Sfakia . By 1 June 1941 , the evacuation was complete and the island was under German occupation . In light of the heavy casualties suffered by the elite 7th " Fliegerdivision " , Hitler forbade further airborne operations . General Kurt Student would dub Crete " the graveyard of the German paratroopers " and a " disastrous victory . " During the night of May 24 , George II and his government were evacuated from Crete to Egypt . Assessments . The Greek campaign ended with complete German victory . The British did not have the military resources to permit them to carry out simultaneous large - scale operations in North Africa and the Balkans . Moreover , even had they been able to block the German advance , they would have been unable to exploit the situation by a counterthrust across the Balkans . The British came very near to holding Crete and perhaps other islands that would have provided air support for naval operations throughout the eastern Mediterranean . In enumerating the reasons for the complete German victory in Greece , the following factors were of greatest significance : Backlash . After the Allies ' defeat , the decision to send British forces into Greece faced fierce criticism in Britain . Field Marshal Alan Brooke , Chief of the Imperial General Staff during World War II , considered intervention in Greece to be " a definite strategic blunder " , as it denied Wavell the necessary reserves to complete the conquest of Italian - held Libya , or to successfully withstand Erwin Rommel ' s " Afrika Korps " March offensive . It thus prolonged the North African Campaign , which otherwise might have been successfully concluded during 1941 . In 1947 , de Guingand asked the British government to recognise its mistaken strategy in Greece . Buckley countered that if Britain had not honored its 1939 commitment to Greece , it would have severely damaged the ethical basis of its struggle against Nazi Germany . According to Historian Heinz Richter , Churchill tried through the campaign in Greece to influence the political atmosphere in the United States and insisted on this strategy even after the defeat . According to Keegan , " the Greek campaign had been an old - fashioned gentlemen ' s war , with honor given and accepted by brave adversaries on each side " and the vastly outnumbered Greek and Allied forces , " had , rightly , the sensation of having fought the good fight . " It has also been suggested the British strategy was to create a barrier in Greece , to protect Turkey , the only ( neutral ) country standing between an Axis block in the Balkans and the oil - rich Middle East . Freyberg and Blamey also had serious doubts about the feasibility of the operation , but failed to express their reservations and apprehensions . The campaign caused a furore in Australia , when it became known that when he received his first warning of the move to Greece on 18 February 1941 , General Blamey was worried , but had not informed the Australian Government . He had been told by Wavell that Prime Minister Menzies had approved the plan . Indeed , the proposal had been accepted by a meeting of the War Cabinet in London at which Menzies was present , but the Australian Prime Minister had been told by Churchill that both Freyberg and Blamey approved of the expedition . On 5 March , in a letter to Menzies , Blamey said that " the plan is , of course , what I feared : piecemeal dispatch to Europe " and the next day , he called the operation " most hazardous " . However , thinking that he was agreeable , the Australian Government had already committed the Australian Imperial Force to the Greek Campaign . Impact on Operation Barbarossa . In 1942 , members of the British Parliament characterised the campaign in Greece as a " political and sentimental decision " . Eden rejected the criticism and argued that the UK ' s decision was unanimous and asserted that the Battle of Greece delayed the Axis invasion of the Soviet Union . This is an argument that historians such as Keegan used to assert that Greek resistance was a turning point in World War II . According to film - maker and friend of Adolf Hitler Leni Riefenstahl , Hitler said that " if the Italians hadn ' t attacked Greece and needed our help , the war would have taken a different course . We could have anticipated the Russian cold by weeks and conquered Leningrad and Moscow . There would have been no Stalingrad " . Despite his reservations , Brooke seems also to have conceded that the Balkan Campaign delayed the offensive against the Soviet Union . Bradley and Buell conclude that " although no single segment of the Balkan campaign forced the Germans to delay Barbarossa , obviously the entire campaign did prompt them to wait . " On the other hand , Richter calls Eden ' s arguments a " falsification of history " . Basil Liddell Hart and de Guingand point out that the delay of the Axis invasion of the Soviet Union was not among Britain ' s strategic goals and as a result the possibility of such a delay could not have affected its decisions about Operation Marita . In 1952 , the Historical Branch of the UK Cabinet Office concluded that the Balkan Campaign had no influence on the launching of Operation Barbarossa . According to Robert Kirchubel , " the main causes for deferring Barbarossa ' s start from May 15 - June 22 were incomplete logistical arrangements and an unusually wet winter that kept rivers at full flood until late spring . " This however does not answer whether in the absence of these problems the campaign could have begun according to the original plan . Keegan writes : Homages to the resistance . In a speech made at the " Reichstag " in 1941 , Hitler expressed his admiration for the Greek resistance , saying of the campaign : " For the sake of historical truth I must verify that only the Greeks , of all the adversaries who confronted us , fought with bold courage and highest disregard of death " The " Führer " ordered the release and repatriation of all Greek prisoners of war , as soon as they had been disarmed , " because of their gallant bearing . " According to Hitler ' s Chief of Staff , Field Marshal Wilhelm Keitel , the " Führer " " wanted to give the Greeks an honorable settlement in recognition of their brave struggle and of their blamelessness for this war : after all the Italians had started it . " Inspired by the Greek resistance during the Italian and German invasions , Churchill said , " Hence we will not say that Greeks fight like heroes , but that heroes fight like Greeks " . In response to a letter from King George VI dated 3 December 1940 , American President Franklin D . Roosevelt stated that " all free peoples are deeply impressed by the courage and steadfastness of the Greek nation " , and in a letter to the Greek ambassador dated 29 October 1942 , he wrote that " Greece has set the example which every one of us must follow until the despoilers of freedom everywhere have been brought to their just doom . "