Danger Valley

the long version

"Just recently, fortune had rewarded Greg Corwin beyond his wildest dreams. Snowbound, with only a few dollars in his pockets and a rich Texas rancher as an opponent in a marathon game of poker, Greg won the stake of a lifetime. And when he took this purse and managed to buy a big spread in the rich Sioux Valley range at a bargain price, he seemed to be leading a charmed life, indeed. But suddenly his luck ran out and on his first day as a ranch-owner he stumbled on an ambush of gunmen attempting to kill a young woman in an overturned buggy. Going to her rescue, he found himself in the middle of a vicious range war. He struggled to remain neutral, but each attempt sucked him deeper into a quicksand of violence."--Publisher description.