These diaries record Che Guevara’s Bolivian campaign day by day, from revolutionary discipline and organization to field isolation and the difficulty of winning a social base. Their force comes from documenting revolution in struggle and failure rather than in triumph, and so they open onto the meaning of defeat as much as onto the meaning of commitment. Fawwaz Traboulsi’s Arabic translation brought to Arab readers one of the twentieth century’s most direct and unsparing revolutionary documents.