Fury of the Mountain Man (Zebra books)

Smoke Jensen was the last mountain man and the quickest draw in the West. But he was tired of fighting every punk who wanted to make a reputation for himself, so he hung up his .45s. It Didn't Last Long... Like Jensen, the two Mexican gunfighters known as Carbone and Martine had put away their six-guns, married and turned to ranching down in Durango. Then they came up against an army of outlaws under a warlord who called himself Carvajal. That was when they called on Smoke Jensen. Smoke didn't waste a minute. When your friends called, you came running. Carvajal laughed when he heard that Smoke Jensen was on the way. After all, what could one man do?