The Tall Men — Will Henry

A soldier turned outlaw, Ben Allison was ready to earn a fortune. Together with his brother Clint he was pushing three thousand longhorns through the rough country between Texas and Montana, where Crazy Horse and his fierce Oglala Sioux waited to waylay them. The tribe wanted the cattle alive and the white Ride-A-Heaps dead. But they'd never gone up against anyone like Ben Allison--the deadliest Ride-A-Heap of them all.