Deep into the territory of the great Apache chief, Cochise, the demoted Civil War general, Lieutenant Colonel Owen Thursday, reports for duty as a commanding officer at the remote U.S. cavalry outpost known as Fort Apache, along with his daughter, Philadelphia. There, the arrogant commander will soon lock horns with the realistic and sensible second-in-command, Captain Kirby York, who, as an expert in the local Apaches, disagrees with Thursday who wants to make a name for himself in the Arizona frontier. In the end, is it wise to engage in battle when personal glory is all you seek?