Ambush At Cimarron Pass - 1958 - 5/10

Army patrol, decimated after an Apache attack, meets a group of ex-Confederates.
Likewise, damaged by Apaches who stole the horses they came to trade.
The Civil War fresh in some, tempers flare, whereupon the Apaches steal ALL the horses.
Fort Waverley is a six day march, during which the group are under guerilla attacks.
Horse-oater is routine B-film. Watch and guess who the next corpse will be.
Early Eastwood credited part will lure many, although he swings from stiff to overbearing.