How the Spanish Civil War Became Europe Season 1 Episode 13 International Brigades Join the Civil War

One of the most important features of the internationalization of the war was the thousands of volunteers in the international brigades that traveled to Spain to join the fight. These groups included Communist party members and others, all answering the call to take up an anti-fascist cause. The American volunteers were famously memorialized by Hemingway in his novel For Whom the Bell Tolls.