In January 1943 the German army, afraid of an Allied invasion of the Balkans, launched a great offensive against Yugoslav Partisans in Western Bosnia. The only way out for Partisan forces and thousands of refugees was the bridge on the river Neretva.

The story follows a band of former Confederate soldiers who were part of a cavalry unit. Their commander, Graff (Rourke) had once been a heroic and staunch supporter of the southern cause, but after losing his family he became cold hearted and ruthless. His second in command is Eustis (Mulroney), whom Graff has trained on the strategies of leadership and combat command.