This work investigates the motivations, experiences, and ultimate impact of the British volunteers who joined the International Brigades to fight against fascism during the Spanish Civil War. Richard Baxell, a historian specializing in the conflict, utilizes extensive archival research, personal diaries, and interviews with surviving veterans to construct a comprehensive account of the British Battalion. The text argues that these volunteers were driven by a complex mix of political idealism, anti-fascist sentiment, and a desire to confront the rising tide of authoritarianism in Europe before the outbreak of the Second World War.

Historians and scholars of the Spanish Civil War frequently cite this work as the definitive account of the British contribution to the Republican cause. Readers often note the meticulous attention to detail and the balanced approach the author takes when documenting the ideological struggles of the volunteers.