# Invasion of Yugoslavia order of battle: Axis

The Axis order of battle for the invasion of Yugoslavia was made up of the various operational formations of the German Wehrmacht and Waffen-SS, Italian Armed Forces and Hungarian Armed Forces that participated in the invasion of Yugoslavia during World War II, commencing on 6 April 1941. It involved the German 2nd Army, with elements of the 12th Army and a panzer group combined with overwhelming Luftwaffe (German Air Force) support. The eighteen German divisions included five panzer divisions, two motorised infantry divisions and two mountain divisions. The German force also included two well-equipped independent motorised regiments and was supported by over 800 aircraft. The Italian 2nd Army and 9th Army committed a total of 22 divisions, and the Royal Italian Air Force (Italian: Regia Aeronautica) had over 650 aircraft available to support the invasion. The Hungarian 3rd Army also participated, with support from the Royal Hungarian Air Force (Hungarian: Magyar Királyi Honvéd Légierő, MKHL).
The Axis ground forces had effectively surrounded the Kingdom of Yugoslavia before the invasion began. The German 2nd Army, consisting of one motorised, one mountain, and two infantry corps was concentrated in southwestern Hungary and southeastern Austria, poised to drive south and east. One motorised corps of the German 12th Army was assembled near Sofia, Bulgaria, along with one motorised corps of the First Panzer Group, and these formations were assigned the task of striking the strongest Yugoslav formations stationed along the eastern border of the country. A further motorised corps was deployed near Timișoara in western Romania, ready to thrust south into the Banat region. The Italian 2nd Army, consisting of one fast (Italian: celere) corps, one motorised corps and three infantry corps was assembled in northeastern Italy, with the task of driving southeast down the Dalmatian coast. The Italian 9th Army, comprising two corps and a sector defence command, was stationed in occupied northern Albania, and its stance was largely defensive. The Hungarian 3rd Army was concentrated along the Yugoslav border largely between the Danube and the Tisza, with the objective of seizing the Bačka and Baranja regions.
German, Italian and Hungarian air support was concentrated in Austria, Italy, southern Hungary, southern Romania, western Bulgaria and Albania. In total, over 1,500 Axis aircraft were available to support the invasion. Naval forces were limited to a few destroyers of the Royal Italian Navy (Italian: Regia Marina) operating in the Adriatic Sea.

## German
### German land forces

The German formations committed to the invasion of Yugoslavia included over 337,000 men, and more than 2,000 mortars, 1,500 artillery pieces, 1,100 anti-tank guns, 875 tanks, and 740 other armoured fighting vehicles. The German land forces were under the overall direction of the commander of the German Army Generalfeldmarschall (Field Marshal) Walther von Brauchitsch.

#### 2nd Army

The German 2nd Army was commanded by Generaloberst (General) Maximilian von Weichs, consisted of one motorised, one mountain, and two infantry corps, and was assembled in southwestern Hungary and southeastern Austria. The LII Infantry Corps suffered significant delays in deploying to its assembly area and was initially held in reserve. According to Schreiber, Stegemann and Vogel, three panzer divisions, four infantry divisions and one motorised infantry division were planned as reserves for the 2nd Army, but they did not participate in the fighting in Yugoslavia. According to Niehorster, these divisions were held as theatre reserves or were allocated to various formations. 2nd Army was supported by three bridging battalions and a road construction battalion.
Composition of German 2nd Army :
| Corps | Commander | Assembly area | Division |
| XXXXVI Motorised | General der Panzertruppe Heinrich von Vietinghoff | Nagykanizsa, southwest Hungary | 8th Panzer Division |
| XXXXVI Motorised | General der Panzertruppe Heinrich von Vietinghoff | Nagykanizsa, southwest Hungary | 14th Panzer Division |
| XXXXVI Motorised | General der Panzertruppe Heinrich von Vietinghoff | Nagykanizsa, southwest Hungary | 16th Motorised Infantry Division |
| XXXXIX Mountain | General der Infanterie Ludwig Kübler | southeast of Klagenfurt, Austria | 1st Mountain Division |
| XXXXIX Mountain | General der Infanterie Ludwig Kübler | southeast of Klagenfurt, Austria | 79th Infantry Division |
| XXXXIX Mountain | General der Infanterie Ludwig Kübler | southeast of Klagenfurt, Austria | 538th Frontier Guard Division |
| LI Infantry | General der Infanterie Hans-Wolfgang Reinhard | Leibnitz, Austria | 101st Light Infantry Division |
| LI Infantry | General der Infanterie Hans-Wolfgang Reinhard | Leibnitz, Austria | 132nd Infantry Division |
| LI Infantry | General der Infanterie Hans-Wolfgang Reinhard | Leibnitz, Austria | 183rd Infantry Division |
| LII Infantry | General der Infanterie Kurt von Briesen | Leibnitz, Austria | 125th Infantry Division |
XXXXVI Motorised Corps was supported by three motorised heavy artillery battalions, a motorised pioneer battalion, a road construction battalion, six bridging columns, and two Luftwaffe anti-aircraft battalions. XXXXIX Mountain Corps included two motorised heavy artillery battalions and a road construction battalion. LI Infantry Corps included seven motorised heavy artillery battalions, two assault gun battalions, two motorised pioneer battalions, two bridging battalions, two road construction battalions, and twelve bridging columns.

#### 12th Army

The German 12th Army was commanded by Generalfeldmarschall Wilhelm List, and consisted of one mountain, three infantry and two motorised corps. Most of the 12th Army was deployed along the Bulgarian-Greek border in preparation for the invasion of Greece, and of the corps commanded by List, only the two motorised corps were committed to the invasion of Yugoslavia. For the first phase of the invasion of Yugoslavia, the First Panzer Group was also assigned to the 12th Army.
Corps of the 12th Army committed to the invasion of Yugoslavia :
| Corps | Commander | Assembly area | Division or regiment |
| XXXX Motorised Corps | General der Panzertruppe Georg Stumme | Kyustendil southwest of Sofia, Bulgaria | 9th Panzer Division |
| XXXX Motorised Corps | General der Panzertruppe Georg Stumme | Kyustendil southwest of Sofia, Bulgaria | 73rd Infantry Division |
| XXXX Motorised Corps | General der Panzertruppe Georg Stumme | Kyustendil southwest of Sofia, Bulgaria | Leibstandarte SS Adolf Hitler |
| XXXXI Motorised Corps | General der Panzertruppe Georg-Hans Reinhardt | near Timișoara, in western Romania | SS Motorised Infantry Division Reich |
| XXXXI Motorised Corps | General der Panzertruppe Georg-Hans Reinhardt | near Timișoara, in western Romania | Großdeutschland Motorised Infantry Regiment |
XXXX Motorised Corps was supported by one motorised anti-tank battalion, three motorised heavy artillery battalions, two motorised pioneer battalions, two bridging battalions, and three motorised bridging columns. XXXXI Motorised Corps included two motorised heavy artillery battalions and a motorised pioneer battalion.

##### First Panzer Group

The First Panzer Group was commanded by Generaloberst Paul Ludwig Ewald von Kleist, and according to Schreiber, Stegemann and Vogel, it consisted of XIV Motorised Corps with two panzer divisions, one mountain, one motorised infantry and one infantry division. According to Niehorster, the XXXXI Motorised Corps was also assigned to First Panzer Group. It assembled northwest of Sofia, Bulgaria.
First Panzer Group :
| Corps | Commander | Division |
| XIV Motorised | General der Infanterie Gustav Anton von Wietersheim | 5th Panzer Division |
| XIV Motorised | General der Infanterie Gustav Anton von Wietersheim | 11th Panzer Division |
| XIV Motorised | General der Infanterie Gustav Anton von Wietersheim | 294th Infantry Division |
| XIV Motorised | General der Infanterie Gustav Anton von Wietersheim | 4th Mountain Division |
| XIV Motorised | General der Infanterie Gustav Anton von Wietersheim | 60th Motorised Infantry Division |
The First Panzer Group was supported by one motorised heavy artillery battalion, one motorised pioneer battalion, one pioneer battalion, two bridging battalions, and two bridging columns. Supporting units of XIV Motorised Corps included two motorised heavy artillery battalions, a motorised pioneer battalion, two bridging columns and one Luftwaffe motorised anti-aircraft battalion.

#### Commanders

* Major German formation commanders
* Generalfeldmarschall Walther von Brauchitsch was in overall command of German land forces
* Generaloberst Maximilian von Weichs commanded the 2nd Army
* General der Panzertruppe Heinrich von Vietinghoff commanded the XXXXVI Motorised Corps
* General der Infanterie Ludwig Kübler commanded the XXXXIX Mountain Corps
* Generalfeldmarschall Wilhelm List commanded the 12th Army
* General der Panzertruppe Georg Stumme commanded the XXXX Motorised Corps
* General der Panzertruppe Georg-Hans Reinhardt commanded the XXXXI Motorised Corps
* Generaloberst Paul Ludwig Ewald von Kleist commanded the First Panzer Group

### German Air Force

The Luftwaffe operated out of bases in Austria, Romania and Bulgaria during the invasion of Yugoslavia. In total, the Germans had over 809 aircraft available to support the invasion of Yugoslavia, more than half of which were positioned in Bulgaria to support the simultaneous invasion of Greece. In total, the Germans fielded 296 fighter aircraft, 89 light bombers, 26 medium bombers and 23 reconnaissance aircraft, and more than 318 dive bombers and 57 heavy fighters. In addition, a reconnaissance squadron equipped with Henschel Hs 126 two-seater reconnaissance aircraft was attached to most of the corps headquarters and every panzer division of the German ground forces. Luftwaffe anti-aircraft units were also attached to the German land forces.

#### 4th Air Fleet

The Luftwaffe 4th Air Fleet (German: Luftflotte IV) was commanded by General der Flieger (Lieutenant General) Alexander Löhr, had its headquarters in Vienna, and direct command units based on airfields in western Austria. These units included one squadron (German: Staffel) of the 121st Reconnaissance Group (German: Aufklärungsgruppe 121), the entire 51st Bomber Wing (German: Kampfgeschwader 51, KG 51), and four bomber groups (German: Kampfgruppen) drawn from the 2nd, 3rd and 4th Bomber Wings (KG 2, KG 3 and KG 4). In total, the 4th Air Fleet had 25 medium bombers, 89 light bombers, 55 dive bombers, 6 reconnaissance aircraft and 1 heavy fighter available in Austria to support the invasion of Yugoslavia.
Composition of 4th Air Fleet :
| Unit | Location | Aircraft type |
| 4th Squadron/121st Long Range Reconnaissance Group | Seyring | 6 × Junkers Ju 88D long-range photo-reconnaissance aircraft 1 × Messerschmitt Bf 110C heavy fighter |
| Headquarters 2nd Bomber Wing | Zwölfaxing | 6 × Dornier Do 17Z light bombers |
| I Group/2nd Bomber Wing | Zwölfaxing | 28 × Dornier Do 17Z light bombers |
| III Group/2nd Bomber Wing | Zwölfaxing | 29 × Dornier Do 17Z light bombers |
| III Group/3rd Bomber Wing | Münchendorf | 26 × Dornier Do 17Z light bombers |
| II Group/4th Bomber Wing | Aspern | 25 × Heinkel He 111P medium bombers |
| Headquarters 51st Bomber Wing | Wiener Neustadt | 1 × Junkers Ju 88A dive bomber |
| I Group/51st Bomber Wing | Wiener Neustadt | 17 × Junkers Ju 88A dive bombers |
| II Group/51st Bomber Wing | Wiener Neustadt | 18 × Junkers Ju 88A dive bombers |
| III Group/51st Bomber Wing | Schwechat | 19 × Junkers Ju 88A dive bombers |

#### Fliegerführer Graz

Fliegerführer Graz was commanded by Oberstleutnant (Lieutenant Colonel) Karl Christ, commander of the 3rd Dive Bomber Wing (German: Sturzkampfgeschwader 3, StG 3). It was located in Graz, Austria, and consisted of the headquarters and II Group of StG 3, the headquarters and II Group (German: Jagdgruppe) of the 54th Fighter Wing (German: Jagdgeschwader 54, JG 54) (less one squadron), and I Group of the 27th Fighter Wing (JG 27). In total, Fliegerführer Graz had 54 fighters, 1 medium bomber and 35 dive bombers available to support the invasion of Yugoslavia.
Composition of Fliegerführer Graz :
| Unit | Aircraft type |
| Headquarters 3rd Dive Bomber Wing | 1 × Junkers Ju 87B dive bomber 1 x Heinkel He 111H medium bomber |
| II Group/3rd Dive Bomber Wing | 34 × Junkers Ju 87B dive bombers |
| Headquarters 54th Fighter Wing | 3 × Messerschmitt Bf 109E fighters |
| II Group/54th Fighter Wing (part) | 24 × Messerschmitt Bf 109E fighters |
| I Group/27th Fighter Wing | 27 × Messerschmitt Bf 109E fighters |

#### Fliegerführer Arad

Fliegerführer Arad was commanded by Oberstleutnant Clemens Graf von Schönborn-Wiesentheid, commander of the 77th Dive Bomber Wing (StG 77). With its headquarters in Arad, Romania, it consisted of the headquarters, I and III Groups of StG 77, headquarters, II and III Groups of the 77th Fighter Wing (JG 77), one squadron of II Group of JG 54, III Group of JG 54 and I Group of the 26th Heavy Fighter Wing (German: Zerstörergeschwader 26, ZG 26). In total, Fliegerführer Arad had 116 fighters, 31 heavy fighters and 68 dive bombers available to support the invasion of Yugoslavia.
Composition of Fliegerführer Arad :
| Unit | Location | Aircraft type |
| Headquarters 77th Dive Bomber Wing | Arad | 3 × Junkers Ju 87B dive bombers 4 × Messerschmitt Bf 109E fighters |
| I Group/77th Dive Bomber Wing | Arad | 33 × Junkers Ju 87B dive bombers 1 × Messerschmitt Bf 110C heavy fighter |
| III Group/77th Dive Bomber Wing | Arad | 32 × Junkers Ju 87B dive bombers |
| Headquarters 77th Fighter Wing | Deta, Romania | 6 × Messerschmitt Bf 109E fighters |
| II Group/77th Fighter Wing | Deta | 34 × Messerschmitt Bf 109E fighters |
| III Group/77th Fighter Wing | Deta | 33 × Messerschmitt Bf 109E fighters |
| 4th Squadron/II Group/54th Fighter Wing | Arad | Messerschmitt Bf 109E fighters |
| III Group/54th Fighter Wing | Arad | 39 × Messerschmitt Bf 109E fighters |
| I Group/26th Heavy Fighter Wing | Szeged, Hungary | 30 × Messerschmitt Bf 110C/D heavy fighters |

#### VIII Air Corps

The VIII Air Corps (German: Fliegerkorps VIII) was commanded by General der Flieger Wolfram Freiherr von Richthofen, who had operational control of all air operations for the invasion. With its headquarters in Gorna Dzhumaya, Bulgaria, it was based at various airfields in western Bulgaria, and consisted of one squadron of the 11th Reconnaissance Group, the headquarters, I and II Groups of the 2nd Dive Bomber Wing (StG 2), I Group of StG 3, the headquarters, II and III Groups of the 27th Fighter Wing, a fighter group and a ground attack group from the 1st Demonstration Wing (German: Lehrgeschwader 1, LG 1), and a reinforced dive bomber group from the 2nd Demonstration Wing. In total, the VIII Air Corps had 126 fighters and 17 reconnaissance aircraft, and more than 25 heavy fighters and 160 dive bombers available to support the invasions of both Yugoslavia and Greece.
Composition of VIII Air Corps :
| Unit | Location | Aircraft type |
| Headquarters 2nd Dive Bomber Wing | Belitsa and Krainici | 4 × Junkers Ju 87B dive bombers 6 × Dornier Do 17P long-range photo-reconnaissance aircraft |
| I Group/2nd Dive Bomber Wing | Belitsa and Krainici | 30 × Junkers Ju 87B dive bombers 9 × Junkers Ju 87R long-range dive bombers |
| III Group/2nd Dive Bomber Wing | Belitsa and Krainici | 35 × Junkers Ju 87B dive bombers |
| I Group/3rd Dive Bomber Wing | Belitsa | 30 × Junkers Ju 87B dive bombers 9 × Junkers Ju 87R long-range dive bombers |
| I Group/1st Dive Bomber Wing | Krainici | 23 × Junkers Ju 87R long-range dive bombers |
| II Dive Bomber Group/2nd Demonstration Wing | Vrazhdebna | 23 × Messerschmitt Bf 109E fighters |
| 10th Dive Bomber Squadron/2nd Demonstration Wing | Krainici | 20 × Henschel Hs 123A biplane dive bomber |
| II Group/26th Heavy Fighter Wing | Kraishte and Vrazhdebna | 25 × Messerschmitt Bf 110C/E heavy fighters |
| Headquarters 27th Fighter Wing | Belitsa and Sofia | 5 × Messerschmitt Bf 109E fighters |
| II Group/27th Fighter Wing | Belitsa and Sofia | 37 × Messerschmitt Bf 109E fighters |
| III Group/27th Fighter Wing | Belitsa and Sofia | 39 × Messerschmitt Bf 109E fighters |
| I Fighter Group/2nd Demonstration Wing | Vrazhdebna | 22 × Messerschmitt Bf 109E fighters |
| I Group/1st Demonstration Wing | Vrazhdebna | Junkers Ju 88A dive bombers |
| 2nd Squadron/11th Long Range Reconnaissance Group | Sofia | 11 × Dornier Do 17P long-range photo-reconnaissance aircraft |
| 7th Squadron/2nd Demonstration Wing | Vrazhdebna | Messerschmitt Bf 110C heavy fighters |
| 7th Sea Rescue Squadron | Varna | various floatplanes |
| IV Group/1st Transport Group | Krumovo | Junkers Ju 52/3m transport aircraft |

#### X Air Corps

The X Air Corps (German: Fliegerkorps X) was based in Sicily, and consisted of four bomber groups, one heavy fighter group and one fighter squadron with a total of 168 aircraft. It was available to provide on-call support to the 4th Air Fleet as required, but only a few units played any part in supporting the invasion because the primary task of X Air Corps was interdicting Allied supply convoys to Malta. Units earmarked for support to the invasion included 7th Squadron of 26th Fighter Wing (JG 26) equipped with Messerschmitt Bf 109E fighters, and III Group of ZG 26, flying Messerschmitt Bf 110C/D heavy fighters.

#### Commanders

* Major German Luftwaffe commanders
* General der Flieger Alexander Löhr commanded the 4th Air Fleet during the invasion
* General der Flieger Wolfram Freiherr von Richthofen commanded the VIII Air Corps

## Italian
### Italian ground forces

The Italian 2nd Army and 9th Army committed a total of 22 divisions to the operation, comprising around 300,000 troops. The Italian ground forces included the Italian garrison of Zara, which was an Italian enclave on the Dalmatian coast.

#### 2nd Army

The Italian 2nd Army (Italian: 2° Armata) was commanded by Generale d’Armata (General) Vittorio Ambrosio, and consisted of one fast (Italian: celere) corps, one motorised corps and three infantry corps, and was assembled in northeastern Italy. The 2nd Army was supported by a motorised engineer regiment including three bridging battalions, a chemical battalion, fifteen territorial battalions, and two garrison battalions.
V Corps support units included three motorised artillery regiments comprising thirteen battalions, four machine gun battalions (two motorised and two pack animal), three Blackshirt legions of battalion size, a motorised anti-aircraft battalion, a sapper assault battalion and a road construction battalion. VI Corps included four motorised artillery regiments with a total of sixteen battalions, two machine gun battalions (one motorised, one pack animal) and a motorised anti-aircraft regiment. XI Corps included one motorised artillery regiment comprising four battalions, three machine gun battalions (one motorised, one pack animal and one static), and six Blackshirt legions of battalion size. The Motorised Corps was supported by a motorised artillery regiment consisting of three battalions, and a motorised engineer battalion.

#### 9th Army

The elements of the Italian 9th Army (Italian: 9° Armata) that were involved in the campaign were commanded by Generale d’Armata (General) Alessandro Pirzio Biroli, and consisted of two infantry corps and some sector troops assembled in northern Albania.
Elements of Italian 9th Army :
| Corps | Commander | Division |
| XIV Corps | Generale di Divisione Giovanni Vecchi | 38th Infantry Division "Puglie" |
| XIV Corps | Generale di Divisione Giovanni Vecchi | 4th Alpine Division "Cuneense" |
| XVII Corps | Generale di Corpo d'Armata Giuseppe Pafundi | 18th Infantry Division "Messina" |
| XVII Corps | Generale di Corpo d'Armata Giuseppe Pafundi | 32nd Infantry Division "Marche" |
| XVII Corps | Generale di Corpo d'Armata Giuseppe Pafundi | 131st Armoured Division "Centauro" |
| Librazhd Sector | Generale di Corpo d'Armata Gabriele Nasci | 53rd Infantry Division "Arezzo" |
| Librazhd Sector | Generale di Corpo d'Armata Gabriele Nasci | 41st Infantry Division "Firenze" |
| Librazhd Sector | Generale di Corpo d'Armata Gabriele Nasci | 24th Infantry Division "Pinerolo" |
XIV Corps was supported by a cavalry regiment, three Border Guard battalions, a Finance Guard battalion and two military police (Italian: Carabinieri Reali) battalions. The XVII Corps included the Diamanti Blackshirt group which incorporated six Blackshirt regiments comprising two battalions each, the Albanian-raised Skanderbeg Blackshirt regiment of two battalions, another Blackshirt regiment of two battalions, a cavalry regiment, a Bersaglieri motorcycle battalion, three Border Guard battalions, one Finance Guard battalion, a motorised artillery regiment of three battalions, a military police battalion, and a tank company equipped with Fiat M13/40 light tanks. The Librazhd Sector included a motorised artillery regiment of four battalions, a bicycle-mounted Bersaglieri regiment, a cavalry regiment, the Biscaccianti Blackshirt group which incorporated two Blackshirt regiments with a total of five battalions, the regimental-sized Agostini Blackshirt Forest Militia, and the Briscotto group, a regimental-sized formation consisting of one Alpini battalion and two Finance Guard battalions.

#### Zara garrison

The Zara garrison numbered about 9,000 men under the overall command of Generale di Brigata (Brigadier) Emilio Giglioli. The garrison consisted of two main groupings and an assortment of supporting units. The two main groupings were the regimental-sized Fronte a Terra (Land Front), which comprised three static machine gun battalions and a bicycle-mounted Bersaglieri battalion, and the battalion-strength Fronte a Mare (Sea Front), which consisted of two machine gun companies, an anti-aircraft battery, a coastal artillery battery and a naval artillery battery. Supporting units consisted of an artillery regiment of three battalions, two independent artillery battalions, a machine gun battalion, a motorised anti-aircraft battalion (less one battery), an engineer battalion, a company of Blackshirts, and a company of L3/35 tankettes.

#### Commanders

* Major Italian commanders
* Generale d’Armata Vittorio Ambrosio commanded the Italian 2nd Army during the invasion
* Generale d’Armata Alessandro Pirzio Biroli commanded the Italian 9th Army during the invasion

### Royal Italian Air Force

The Royal Italian Air Force (Italian: Regia Aeronautica) operated out of bases in southeastern and northeastern Italy and Albania during the invasion of Yugoslavia. In total, the Italians had 658 aircraft available to support the invasion, 222 of which were positioned in Albania to also support the German invasion of Greece. These aircraft comprised 296 fighter aircraft, 40 dive bombers, 192 medium bombers, 12 bomber floatplanes and 118 reconnaissance aircraft.

#### 2nd Air Force

The headquarters of the 2nd Air Force (Italian: 2nd Squadra Aerea) was at Padua, in northeastern Italy under the command of Generale di Squadra Aerea (Lieutenant General) Tullio Toccolini. It comprised two fighter wings, one bomber wing, two independent bomber groups, three reconnaissance groups and one independent reconnaissance squadron. In total, the 2nd Air Force had 90 fighters, 61 medium bombers and 49 reconnaissance aircraft available to support the invasion of Yugoslavia.
Composition of Italian 2nd Air Force :
| Unit | Location | Aircraft |
| 4th Fighter Wing | Gorizia | 46 × Macchi C.200 fighters |
| 54th Fighter Wing | Treviso | 44 × Macchi C.200 fighters |
| 18th Bomber Wing | Aviano | 32 × Fiat BR.20 medium bombers |
| 25th Bomber Group | Forli | 15 × Fiat BR.20 medium bombers |
| 99th Bomber Group | Vicenza | 14 × Fiat BR.20 medium bombers |
| 61st Reconnaissance Group | Gorizia | 8 × Caproni Ca.311 reconnaissance aircraft 8 × IMAM Ro.37bis reconnaissance biplanes |
| 63rd Reconnaissance Group | Udine | 14 × IMAM Ro.37bis reconnaissance biplanes |
| 71st Reconnaissance Group | Udine | 12 × IMAM Ro.37bis reconnaissance biplanes |
| 128th Reconnaissance Squadron | Gorizia | 7 × Caproni Ca.311 reconnaissance aircraft |

#### 4th Air Force

The headquarters of the 4th Air Force (Italian: 4th Squadra Aerea) was at Bari, in southern Italy under the command of Generale di Squadra Aerea Augusto Bonola. It comprised two independent fighter groups and one independent fighter squadron, four bomber wings, one combined bomber and naval bomber wing, two independent bomber groups and one independent dive bomber equipped with German Junkers Ju 87B Stuka aircraft. In total, the 4th Air Force had 73 fighters, 20 dive bombers, 131 medium bombers and 12 bomber floatplanes available to support the invasion of Yugoslavia.
Composition of Italian 4th Air Force :
| Unit | Location | Aircraft |
| 8th Independent Fighter Group | Oria | 14 × Macchi C.200 fighters |
| 153rd Independent Fighter Group | Brindisi | 38 × Macchi C.200 fighters 9 × Fiat CR.42 biplane fighters |
| 370th Independent Fighter Squadron | Grottaglie | 12 × Macchi C.200 fighters |
| 13th Bomber Wing | Gioia del Colle | 24 × Fiat BR.20 medium bombers |
| 35th Bomber/Naval Bomber Wing | Brindisi | 15 × CANT Z.1007bis medium bombers 12 × CANT Z.1007bis bomber floatplanes |
| 37th Bomber Wing | Lecce | 20 × Fiat BR.20M medium bombers 7 × Fiat BR.20 medium bombers |
| 38th Bomber Wing | Foggia | 16 × Fiat BR.20 medium bombers |
| 47th Bomber Wing | Grottaglie | 26 × CANT Z.1007bis medium bombers |
| 50th Bomber Group | Brindisi | 8 × CANT Z.1007bis medium bombers |
| 104th Bomber Group | Foggia | 15 × Savoia-Marchetti SM.79 medium bombers |
| 97th Dive Bomber Group | Lecce | 20 × Junkers Ju 87B dive bombers |

#### Air Command Albania

The headquarters of Air Command Albania (Italian: Comando Aeronautica Albania) was located at Tirana, Albania under the command of Generale di Squadra Aerea Ferruccio Ranza. It comprised five fighter groups, one dive bomber group equipped with German Junkers Ju 87B Stuka aircraft, three independent reconnaissance groups and two independent reconnaissance squadrons. In total, the Italians had 133 fighters, 20 dive bombers and 69 reconnaissance aircraft available in Albania to support the invasions of Yugoslavia and Greece.
Composition of Air Command Albania :
| Unit | Location | Aircraft |
| 22nd Fighter Group | Tirana | 37 × Macchi C.200 fighters |
| 24th Fighter Group | Devoli | 26 × Fiat G.50 fighters 1 × Caproni Ca.111 reconnaissance aircraft |
| 150th Fighter Group | Valona | 20 × Macchi C.200 fighters |
| 154th Fighter Group | Devoli | 20 × Fiat G.50 fighters |
| 160th Fighter Group | Tirana | 30 × Fiat CR.42 biplane fighters |
| 101st Dive Bomber Group | Tirana | 20 × Junkers Ju 87B dive bombers |
| 5th Reconnaissance Group | Berat | 18 × IMAM Ro.37bis reconnaissance biplanes |
| 70th Reconnaissance Group | Tirana | 17 × IMAM Ro.37bis reconnaissance biplanes |
| 72nd Reconnaissance Group | Valona | 9 × IMAM Ro.37bis reconnaissance biplanes 9 × Caproni Ca.311 reconnaissance aircraft |
| 35th Reconnaissance Squadron | Pequini | 8 × IMAM Ro.37bis reconnaissance biplanes |
| 87th Reconnaissance Squadron | Tirana | 7 × Caproni Ca.311 reconnaissance aircraft |

### Royal Italian Navy

Three destroyers of the Royal Italian Navy (Italian: Regia Marina) were deployed into the Adriatic in direct support of the invasion, and other units were tasked to suppress the Royal Yugoslav Navy.

## Hungarian
### Royal Hungarian Army

The Hungarian Army (Hungarian: Magyar Honvédség) committed the Mobile, I, IV and V Corps of Vezérezredes (Lieutenant General) Elemér Gorondy-Novák's 3rd Army to the invasion. The 1st Parachute Battalion was earmarked for airborne operations. The Hungarian invasion force was deployed along the Yugoslav border largely between the Danube and the Tisza.
Elements of the Hungarian 3rd Army :
| Formation-unit | Commander | Brigade-battalion |
| Mobile Corps | Altábornagy Béla Miklós | 1st Motorised Brigade |
| Mobile Corps | Altábornagy Béla Miklós | 2nd Motorised Brigade |
| Mobile Corps | Altábornagy Béla Miklós | 1st Cavalry Brigade |
| I Corps | Altábornagy Zoltán Decleva | 1st Infantry Brigade |
| I Corps | Altábornagy Zoltán Decleva | 13th Infantry Brigade |
| I Corps | Altábornagy Zoltán Decleva | 15th Infantry Brigade |
| IV Corps | Altábornagy László Horváth | 2nd Infantry Brigade |
| IV Corps | Altábornagy László Horváth | 10th Infantry Brigade |
| IV Corps | Altábornagy László Horváth | 12th Infantry Brigade |
| V Corps | Altábornagy Antal Silley | 14th Infantry Brigade |
| V Corps | Altábornagy Antal Silley | 19th Infantry Brigade |
| V Corps | Altábornagy Antal Silley | 2nd Cavalry Brigade |
| Independent Brigade | Vezérőrnagy János Székely | 9th Infantry Brigade |
| Independent Brigade | Vezérőrnagy János Dömötör | 11th Infantry Brigade |
| Independent Battalion | Alezredes Árpád Bertalan | 1st Parachute Battalion |

### Royal Hungarian Air Force

The Royal Hungarian Air Force (Hungarian: Magyar Királyi Honvéd Légierő, MKHL) committed its 1st Air Brigade to the invasion, consisting of four fighter groups of the 1st and 2nd Air Regiments flying Fiat CR.42 biplane fighters, one reinforced bomber group from the 3rd and 4th Air Regiments with Junkers Ju 86 and Caproni Ca.135bis twin-engined bombers, and one reconnaissance group from the 5th Air Regiment operating Heinkel He 170A reconnaissance aircraft. Savoia-Marchetti SM.75 transports were used to transport the 1st Parachute Battalion.