Spanish Republican Army The Spanish Republican Army , , was the main branch of the Armed Forces of the Second Spanish Republic between 1931 and 1939 . It became known as People ' s Republican Army ( " Ejército Popular de la República " ) after it was reorganized , following the disbandment of the voluntary militias that were formed in July 1936 at the beginning of the Spanish Civil War . History . The Spanish Republican Army went through two clear phases during its existence : Background . The losing of the last colonies , Cuba and Philippines in 1898 made the popularity of the armed forces wane in Spain . Military leaders resented the attitude of the Spanish politicians and the public opinion who unjustly blamed the Spanish Military for the failures in the colonies . In November 1905 Spanish Army personnel stormed the offices of Catalan magazine Cu - Cut ! , where also En Patufet and La Veu de Catalunya were located , for having published a caricature ridiculing the military . Following the attacks , the Captain general s of Sevilla , Barcelona and Madrid openly opposed the prosecution of those members of the military involved in the storming . This crisis led in 1906 to the approval of the " Ley de Jurisdicciones " ( " Law of Jurisdictions " ) , which severely restricted freedom of expression in Spain by making speech against " Spain and its symbols " — the Spanish Armed Forces including themselves as one of the symbols — a criminal offence . According to renowned writer Salvador de Madariaga the Spanish Armed Forces became henceforward a " State within the State " that would interfere in civilian matters in an overbearing manner , becoming a major player in Spanish politics . Other Spanish intellectuals such as Miguel de Unamuno and Ramiro de Maeztu were seriously worried at the time about the future implications of the " Law of Jurisdictions " . Unamuno openly expressed his concern that it would be left to the military to define what was correct regarding patriotism . The " Moroccan Question " ( ) , however , would be the main cause of the ensuing fractures in the political and social life in Spain . The disastrous wars in Morocco ended up bringing about severe social reactions in Spain that could no longer be silenced by means of the " Law of Jurisdictions " . The Tragic Week protests in Barcelona in July 1909 , which quickly turned anticlerical , were primarily the result of the unpopular Moroccan wars that " merely satisfied the needs of the Military " in the eyes of the public . The consequence of such developments was that the division between the Spanish military and the Spanish people became deeper . The liberal traditions that the Spanish Army had spearheaded in the 19th century were replaced by a defensive , reactionary outlook . The mutual suspicion led to the creation of the " Juntas de Defensa " ( Boards of Defence ) during the 1917 Spanish crisis caused by the First World War . The Spanish military had an excess of officers , as much as 16 . 000 officers for 80 . 000 troops at one point and the economic crisis , coupled with a low pay , brought the problem of the economic hardships of military families to the fore . Allegedly the aim of the " Juntas de Defensa " was to defend the interests of Spanish military officers , but their intention to get involved in political issues was clear to the public . Finally on 13 September 1923 , General Miguel Primo de Rivera made a successful coup d ' etat . After overthrowing the parliamentary government he established himself as dictator with the tacit consent of King Alfonso XIII . The General ' s dictatorship , however , did not solve the problems of the Spanish Armed Forces for the support of the military institution for General Primo de Rivera ' s move was not unanimous . Already in 1926 there was the first serious attempt of a coup , popularly known as " La Sanjuanada " ( after St John ) , against the dictator in which four high - ranking generals — Valeriano Weyler , Domingo Batet , Francisco Aguilera and José Riquelme y López - Bago , as well as Colonel Segundo García and Lieutenant colonel Cristino Bermúdez de Castro — were involved . Besides the failed coup , the resistance of the Artillery branch of the Spanish Army to General Primo de Rivera ' s attempts to integrate and reorganize the Spanish military , created uneasiness within the ranks and in the face of the stubbornness of the Artillery officers in Pamplona , he had to declare Martial law ( " Estado de Guerra " ) . Henceforward the Artillery officers would develop a pro - Republican stance . The Second Spanish Republic was preceded by two pro - Republican coup attempts , the Jaca Uprising led by Fermín Galán and a rebellion of Air Force officers in Cuatro Vientos and Getafe air bases . The first years of the Republic ( 1931 - 1936 ) . In 1931 , following the proclamation of the Second Spanish Republic , the armed forces of the Spanish Kingdom became the Spanish Republican Armed Forces . Admiral Aznar ' s casual comment : " Do you think it was a little thing what happened yesterday , that Spain went to bed as a monarchy and rose as a republic " became instantly famous , going quickly around Madrid and around Spain , making people accept the fact and setting a more relaxed mood . Republicans within the Spanish Armed forces were then a minority , but so were pro - monarchist reactionaries ; the majority within the military were at first indifferent . What began to antagonize the Spanish Military against the new government were the reforms of the armed forces introduced by newly nominated Republican Minister of War Manuel Azaña within the first months of the new government . The officers of the Armed Forces resented that a man without a military background had been appointed to lead the War Ministry . Later in October the same year Azaña became Prime Minister and continued the reform of the bloated and old - fashioned military the Republic had inherited . This was seen as a necessary step with the goal to modernize the Spanish Military and cut down the expenses of the state in the aftermath of the Great Depression . In order to implement its reforms the Republican Government promoted to high posts military men that it perceived as loyal . As a result it tended to display favoritism towards the branches of the Armed Forces more amenable to its reforms , the Air Force and , in a lesser degree , the Navy . Officers such as Gonzalo Queipo de Llano and Ramón Franco with a background in the pro - republican Jaca and Cuatro Vientos - Getafe uprisings during the monarchy rose to high posts for which they were not the most competent . In the same manner Spanish Republican Navy officers who displayed pro - republican fervor were rewarded with political posts . On 10 August 1932 a pro - monarchist general , José Sanjurjo , staged a rebellion in Seville against the Republican Government . He led a group of officers opposed to the military reforms , as well as to the policy of granting autonomy to Catalonia and the Basque Country which they resented an " affront to the unity of Spain " . The rebellion failed and became popularly known as " La Sanjurjada " . General Sanjurjo was subsequently arrested and court - martialed . Initially he was condemned to death , but his sentence was later commuted to life imprisonment in Dueso . In March 1934 Sanjurjo was granted amnesty by the Lerroux government and went into exile in Estoril , Portugal . In July 1936 , five years after the proclamation of the republic , a section of the Spanish Republican Army in Spanish Morocco rebelled under the orders of General Franco . Although relatively more successful than the 1932 " Sanjurjada " , this rebellion succeeded only in fractioning Spain , with roughly half of the territory still loyal to the Republic . Instead of giving up or calling for a compromise , Franco went ahead and began a bloody war of attrition , the Spanish Civil War . During the Civil War the part of the army loyal the Spanish republican government would have to fight against the better equipped fraction of the army in revolt and their powerful Third Reich and Italian Fascist supporters . The Civil War ( 1936 - 1939 ) . After the partly successful coup of the pro - fascist generals in July 1936 , militias were formed in many cities in Spain that had not sided with the rebellion lest the units of the Spanish Republican Army stationed in their territory be tempted to join the rebels . Finally in October the Republican government reorganized its armed forces around the military units that had remained loyal and the militias were merged with the new army . October 1936 : First war - dictated reorganization . The government of the areas that had not joined the rebels , known as ' Victory Government ' ( " Gobierno de la Victoria " ) , quickly organized a ' Regular Popular Army ' ( " Ejército Popular Regular " ) ( EPR ) . Led by all the parties composing the Popular Front ( " Frente Popular " ) , and by the trade unions " Confederación Nacional del Trabajo " ( CNT ) and " Unión General de Trabajadores " ( UGT ) . The militias that had been hurriedly armed in the wake of General Franco ' s coup had been loosely coordinated by the Popular Front coalition . The new structure sought to impose a more effective coordination of the loyalist forces , for the Republican government had lost effective control of the armed units defending it . The changes in the structure began on 16 October 1936 , doing away with the War Ministry which was replaced by the ' National Defence Ministry ' ( " Ministerio de la Defensa Nacional " ) , led by the president of the republic , Largo Caballero . By means of this new structure , the Regular Popular Army unified all the branches of the military , as well as all scattered militias , a process that would be gradually implemented with the goal of completing it by February 1937 . By 30 October all Spanish males aged between 20 and 45 would be conscripted . The restructuring of the Spanish Republican Army showed the Communist influence in the new discipline imposed by the Popular Front authorities . The new Republican People ' s Army instituted the " Comisariado de Guerra " by means of which political commissar s were charged with the mission of lifting the morale of the troops and ensuring their cooperation with their high - rank officers in all units . The commissar had to overcome the mistrust of the troops towards the officers in order to achieve the necessary discipline for proper coordination . Based on a model that would replace the columns ( " columnas " ) and militias , the Mixed Brigade ( " Brigada mixta " ) was the basic military unit of the Republican People ' s Army . The first six Mixed Brigade s were created on 18 October 1936 . The first was led by Communist colonel Enrique Líster , the second by Jesús Martínez de Aragón , the third by José María Galán , the fourth by Eutiquiano Arellano , the fifth by Fernando Sabio and the sixth by Miguel Gallo Martínez . The reorganization included as well the XI and XII International Brigades joining the Republican People ' s Army in its combat . Anti - fascist volunteers from all over the world that joined the brigades would be trained in Albacete . Development of the war . The Spanish Republican Army units often lacked proper equipment . The situation improved somewhat by spring 1937 , but certain units remained short of equipment and ammunition throughout the war . The shortage of proper clothing , boots , weapons and ammunition was especially acute during the first months of the war , right after the reorganization . Priority , however , was given to ensure that the Republican troops received adequate food rations and that they received their salaries . Usually the latter were paid to the soldier ' s families in their homes . The reorganization of the Spanish Republican Army would be almost complete by mid - 1937 . Groups such as the Antifascist Worker and Peasant Militias , " Milicias Antifascistas Obreras & Campesinas " ( MAOC ) , the militias of the Socialist Youth ( " Juventudes Socialistas Unificadas " ) , the Communist Fifth Regiment ( " Quinto Regimiento " ) , as well as the Anarchist militias would be rallied under one banner and given proper military training . In places such as the Aragon Front , however , the Anarchist and minority Communist groups , such as the POUM , resisted what they saw as Communist - led " militarization " . They distrusted the Communist leadership and perceived the move as an effort to force them to abandon their militia model , making them depend from a single central power , which was against their ideals . The power and leadership of the Communists within the armed forces was promoted by the government of Juan Negrín and its Communist Party of Spain allies . The Soviet Union , profiting from the international isolation of the Spanish Republic imposed by the Non - intervention agreements , assisted the beleaguered Republican government chiefly by providing weapons . Despite the fact that the Soviet arms shipments were duly paid at high prices , the USSR used this opportunity to extend its power over the Spanish Republic . In April 1938 Socialist minister of defense Indalecio Prieto resigned in protest at the level of Soviet influence over the Spanish Republican Army . The influence of the USSR was largely the consequence of the fact that the western democracies , like France , the United Kingdom and the United States didn ' t help the young Spanish Republic . Afraid of the " Communist threat " Neville Chamberlain and Léon Blum were ready to sacrifice Spain , as they later would sacrifice Czechoslovakia , in the belief that Adolf Hitler could be appeased . In the void thus created , only the Soviet Union helped the Spanish government effectively , but its assistance came at a high monetary cost . At the end of October 1936 , three months after the rebels had been supplied with German and Italian weapons by Hitler and Mussolini , the first Soviet war supplies arrived to alleviate the lack of material in the loyalist side . The People ' s Republican Army would be reaching its highest level of organization in the Battle of the Ebro , during the last half of 1938 , but it was also the battlefield where its back would be broken . Very young soldiers , averaging 17 and a half in age , whose unit was known as the ' Baby bottle conscription ' ( " " quinta del biberón " " ) would be mobilized for this last big battle of the Civil War , the last one in which the International Brigades would operate . These type of large war operations fulfilled the Communist propaganda goals promoted by Juan Negrín and his clique , but would be disastrous and wasteful for the Spanish Republican Army , whose energy and organization would have been better employed in small - scale operations . Final offensive and end of the war . Opposed by high - ranking officers such as republican Catholic general Vicente Rojo Lluch , ' Stalinist ' influence would only abate right at the end of the Civil War with the creation of a National Defence Council ( " Consejo Nacional de Defensa " ) by Segismundo Casado , commander of the Central Army , and Julián Besteiro . But by then General Franco vehemently refused any compromise and wanted only total victory and the humiliation and disbandment of the Spanish Republic . The Spanish Republican Army broke up towards the end of March 1939 when the Soldiers of the Republic surrendered their posts and weapons to the victorious Francoist armies . Many of them had to face immediately the firing squad , especially the professional officers and the volunteers , while the remainder were brought to concentration camp s where some of them would be shot later , as their records would be checked . Among the members of the Republican Armed Forces who escaped , many were interned in concentration camps in Southern France , such as the Camp de concentration d ' Argelès - sur - Mer which held about 100 , 000 defeated Spanish Republicans at a certain point in time . From there some managed to go into exile or went to join the armies of the Allies to fight against the Axis powers , while part of them ended up in Nazi concentration camps . Finally , there was a smaller group of men which would scatter and hide in the mountainous areas of Spain , such as the Montes de Toledo , the Galician Massif , the Pyrenees and the cordilleras of the Iberian System . There they would wage a guerrilla war with the Spanish Maquis , the last military units to fly the flag of the Spanish Republic , well into the 1960s . Organization and structure during the Spanish Civil War . Faced with a war situation the Republican Army based its organization in the mixed brigades ( " brigadas mixtas " ) . Each of these was composed of four battalion s . Every battalion included a number of companies . A regular " brigada mixta " would not exceed 3 , 000 men . As the war unfolded , the Spanish Republican Army would include regiment s , divisions , corps and field armies . Most of the foreign volunteer combatant would be part of the International Brigades ' ( " Brigadas internacionales " ) own sections until they were ordered to withdraw by the Non - Intervention Committee in the fall of 1938 . May 1937 . In May 1937 the Popular Army was structured in the following armies in the territory that was still under its control : December 1937 . Towards the end of 1937 , after the loss of the Northern Zone , the structure of the People ' s Republican Army underwent some important changes , even though it kept the structure of the previous six months . July – August 1938 . After the Spanish Republican territory was split in two in April 1938 , there was an emergency reorganization of the military units that implied deep changes both in the structure as well as in the general distribution of the remaining battle - ready armies .