International Brigades

• 1. Origins And Formation

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  The Communist International began recruiting volunteers for Spain in September 1936. A British writer named Tom Wintringham proposed using foreign communist parties to fight for the Spanish Republic just weeks after the war started. The Comintern agreed to start recruiting international volunteers one week after the London meeting of the Non-Intervention Committee confirmed that Western democracies would not provide military aid. An open letter by Joseph Stalin appeared in Mundo Obrero on the 17th of October 1936, arguing that victory was a matter for all progressive humanity. Volunteers arrived at Albacete, the headquarters located inside the Gran Hotel. André Marty served as commander while Luigi Longo acted as Inspector-General and Giuseppe Di Vittorio as chief political commissar. Many volunteers were unemployed workers from France or adventurers seeking to restore democracy. Some 500 communists exiled to Russia returned to Spain with valuable experience from World War I. Karol Świerczewski supervised recruitment efforts from Paris before sending men to Spain by train or ship.

• 2. Major Combat Engagements

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  The XI International Brigade took up position at Casa de Campo on the 9th of November 1936 during the Siege of Madrid. General Kléber launched an assault that lasted through the night and part of the next morning. The brigade lost a third of its personnel but forced Nationalist troops to retreat. On the 13th of November, the XII International Brigade deployed to Cerro de Los Angeles under command of General Lukacs. Language problems and poor coordination caused the attack to fail completely. The battle in University City continued until three-quarters fell under Nationalist control. The Thälmann Battalion arrived at Las Rozas on the 6th of January 1937 and held positions until destroyed as a fighting force. The British Battalion fought at Suicide Hill on the 12th of February 1937 where only 225 of 600 members remained after seven hours of heavy fire. One company was captured when Nationalists advanced singing The Internationale among their ranks. The Garibaldi Battalion stopped a Nationalist advance across the Jarama river with heavy fire. Italian forces attempted another assault on Guadalajara starting the 9th of March 1937 with 35,000 men and 80 tanks. Scouts from both sides exchanged information without realizing they were enemies because they spoke Italian.

• 3. Demographics And Composition

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  About 32,000 foreigners volunteered to defend the Spanish Republic between 1936 and 1938. France provided the largest number of volunteers with estimates ranging from 8,962 to 9,000 men. Italy contributed between 3,000 and 3,350 fighters while Germany sent 3,000 to 5,000 including Austrians. Poland supplied approximately 500 direct recruits though some sources claim up to 5,000 total Polish citizens. About 22% of all brigadiers were Jewish according to historical records. A Jewish company named after Naftali Botwin formed within the Polish battalion in December 1937. The British Battalion included many from Ireland, Australia, New Zealand, South Africa, and Cyprus alongside native Britons. The Mackenzie-Papineau Battalion represented Canadian volunteers who later faced investigation by the Royal Canadian Mounted Police upon returning home. Smaller contingents came from Romania (400), Bulgaria (462), Czechoslovakia (2,200), Yugoslavia (1,900, 2,095), Hungary (528, 1,500), Greece (290, 400), Finland (225), Sweden (550), Norway (225), Denmark (550), Switzerland (800), Estonia (200), China (100), Albania (43), Portugal (134), Cyprus (60), Philippines (50), and New Zealand (20). Some battalions contained one Spanish volunteer company of about 150 men starting from spring 1937.

• 4. Casualties And Losses

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  Conflicting reports exist regarding the number of brigadiers killed during the conflict. An Albacete staff report from late March 1938 claimed 4,575 killed in action while an NKVD communication to Moscow in July 1938 stated 3,615 KIA. Prime Minister Juan Negrín mentioned 5,000 fallen in his farewell address on the 28th of October 1938. Some historians estimate as high as 15,000 total casualties though others consider this figure unfounded. A mid-1970s calculation offered exactly 9,934 dead or missing personnel. The Osprey series claims at least 7,800 were killed while other authors suggest a range between 6,100 and 6,500. Non-scholarly publications sometimes cite figures around 4,000 known deaths. Estimates for the ratio of killed in action vary dramatically from 8.3% to over 33%. German volunteers suffered losses between 22% and 60% according to different sources. Polish fighters experienced casualty rates ranging from 30% to 62%. Yugoslav volunteers faced ratios between 35% and 50% while Canadian contingents lost between 43% and 57% of their numbers. Approximately 65 to 500 volunteers drowned when the Ciudad de Barcelona ship sank off Malgrat de Mar on the 30th of May 1937. Total casualties including wounded and missing reach figures between 48,909 and 59,380 depending on how duplicates are counted.

• 5. Disbandment And Withdrawal

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  The Republican government announced the decision to disband International Brigades on the 21st of September 1938 before the League of Nations. This move aimed to persuade Western democracies like France and Britain to end their arms embargo on the Republic. By this time approximately 10,000 foreign volunteers still served in Spain against about 50,000 foreign conscripts supporting the Nationalists. Half of all brigadiers were exiles or refugees from Nazi Germany, Fascist Italy, Hungary, and other authoritarian regimes who could not safely return home. These men received honorary Spanish citizenship and integrated into Spanish units of the Popular Army instead of being repatriated. The Belgian and Dutch volunteers lost their citizenship because they had served in a foreign army. The operation was dissolved officially on the 23rd of September 1938 by Prime Minister Juan Negrín. Some survivors later fought during World War II while others remained in exile for decades. The disbandment represented an ill-advised effort to gain support from liberal democracies through the Non-Intervention Committee.

• 6. Post-War Political Legacies

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  Koča Popović briefly served as vice-president of Yugoslavia between 1966 and 1967 making him the highest-ranking post-war IB combatant. Two former brigadiers became prime ministers: Mehmet Shehu in Albania (1954, 1981) and Ferenc Münnich in Hungary (1958, 1961). Heinrich Rau chaired the DWK government that would become East Germany from 1948 to 1949. Three deputy prime ministers emerged including Petre Borilă in Romania (1954, 1965), Eugeniusz Szyr in Poland (1959, 1972), and Pietro Nenni in Italy (1963, 1968). Rodoljub Čolaković served as prime minister of Bosnia and Hercegovina until 1948. Erich Mielke held power as head of Ministry for Security in East Germany while Heinz Hoffmann commanded the Nationale Volksarmee. In Czechoslovakia, Josef Pavel assumed the ministry of interior during 1968 after serving as chairman of the National Front. Many former volunteers entered political bureaus or held key positions in army and security structures across communist states. Jack Jones became General Secretary of General Workers Union in Britain by the mid-1970s considered the most powerful person there. Survivors of the Mackenzie-Papineau Battalion faced investigation by Canadian authorities and denial of employment upon returning home. A monument dedicated to Canadian IB veterans appeared in Ottawa's Green Island Park in 2001.