The idea of an international force of volunteers to fight for the Republic was initiated by Maurice Thorez, the French Communist Party leader. Joseph Stalin agreed and in September 1936 the Comintern began organising the formation of International Brigades. An internatinal recruiting centre was set up in Paris and a training base at Albercete in Spain.
Battalions estblished included the Abraham Lincoln Battalion, British Battalion, Connolly Column, Dajakovich Battalion, Dimitrov Battalion, Mackenzie-Papineau Battalion, George Washington Battalion, Mickiewicz Battalion and Thaelmann Battalion.
A total of 59,380 volunteers from fifty-five countries served during the Spanish Civil War. This included the following: French (10,000), German (5,000), Polish (5,000), Italian (3,350), American (2,800), British (2,000), Canadian (1,000), Yugoslavian (1,500), Czech (1,500), Canadian (1,000), Hungarian (1,000) and Scandinavian (1,000). These men were organized into the 11th, 12th, 13th, 14th and 15th of the Mixed Brigades.
Men who fought with the Republican Army included George Orwell, André Marty, Christopher Caudwell, Jack Jones, Len Crome, Oliver Law, Tom Winteringham,