A Reason to Live, a Reason to Die (originally titled Una Ragione Per Vivere E Una Per Morire, also known as Massacre at Fort Holman) is a 1972 Technicolor Italian spaghetti Western movie starring James Coburn, Bud Spencer, and Telly Savalas.

Many exterior scenes were filmed at the Fort Bowie set built in the Province of Almería, Spain, where the desert landscape and climate that characterizes part of the province have made it a much utilized setting for Western films, among those A Fistful of Dollars, The Good, the Bad and the Ugly, Once Upon a Time in the West, and later 800 Bullets.

Disgraced former US colonel Pembroke (James Coburn) wants to recapture Fort Holman, which he had previously surrendered to the Confederate army without a shot having been fired.

The other "volunteers" are a deserter who killed two sentries, a soldier who murdered his commanding officer and raped his wife, a horse thief, two other looters (one of whom stole medicine, which caused soldiers to die), and an Indian "bastard" who had killed a white man who sold alcohol to Apaches.

The man presented as "the worst of the bunch" – a religious pacifist agitator – declines the offer of freedom and is hanged.

Eli is an infiltrator entering the fort and piling one false motive on top of the other to cover his true intentions.