Callaghen Book by Louis L'Amour

River of gold, river of blood... Callaghen's business is soldiering. For twenty years he's fought all over the world--from China to California--now he's a private in the U.S. cavalry, poorly paid, his enlistment about to run out. He's ready to move on. Until he saves the lives of his patrol in a brutal encounter in the harsh Mohave Desert and comes across a startling discovery: a treasure map belonging to a dead lieutenant who may not have been all he seemed. The map points the way to an underground river of gold...or does it? To find out, Callaghen will have to fight the toughest war of his life: against a fierce Indian warrior, a vindictive commanding officer, and a ruthless gang of outlaws who'll turn what may be a river of gold into a river of blood. Published By Bantam on 1998