Edited by Daniel James, re-issued with an introduction of mine.
Here is an excerpt from my introduction.
“[The diaries] are the very frank and personal journals of a man trying desperately, and against great odds, to do something that proved impossible. He records all the irritation, pain, and disappointment of his mission. There are no heroic phrases, no ringing cries to rush to the barricades. The diaries comprise, whatever else, a poignant story, courageous but sad; they chronicle the increasing hopelessness of Guevara’s undertaking, and end only the day before the inevitable disaster, which one can foretell almost with certainty by the middle of the written entries.”