A 2,400 year old memoir by a Greek soldier is being turned into a feature film by Sony Pictures. Dubbed “Anabasis”, the movie will recount the tale of Xenophon, a soldier who was among 10,000 elite mercenaries who attacked the Persian empire and who led them back through hostile terrain after their leader was betrayed and slain.

He wrote the whole thing down after he reached home. Robert Schenkkan, a Pulitzer Prize-winning playwright, is adapting the memoir into a script.