Algeria, 1959. Military operations are being stepped up. High in the mountains of Kabylia, Terrien (Benoit Magimel), an idealistic lieutenant takes over the command of a platoon at a French army outpost. Here he meets Dougnac (Albert Dupontel), a cynical sergeant. Their differences and the harsh realities in the field drive the two men to the breaking point. Lost in an undeclared war, they discover that their worst enemy is themselves.