Lupin the Third: The Hemingway Papers(1990)

Overview:

A bloody civil war is the setting for Lupin's latest caper; the leader for one of the factions holds documents written by Earnest Hemingway and contain the location of a remarkable treasure. With Goemon and Jigen fighting on opposite sides of the war, Lupin must tackle this challenge alone. As the war rages on, can Lupin secure the treasure and keep Goemon and Jigen from killing each other?!