The participation of the International Brigades in the Spanish Civil War, from 1936 to 1939, was a great but overwhelmingly tragic adventure. According to Geoffrey Cox, an enthusiastic young journalist from New Zealand in Madrid at the time, it was ‘the most truly international army the world has seen since the Crusades’. Romance, bravery, and sacrifice were combined with bastardry, suffering, and humiliation, marred by often lazy and amateurish tactics, including the fatal notion that military discipline was a form of ‘class oppression’. Giles Tremlett’s richly documented new account overflows with exhilaration and alcohol, along with sabotage, treachery, and utter disorganisation. Perhaps it was the very failure of this romantic intervention that has encouraged, over the decades, a rose-tinted vision: a history, in effect, written by the losers.