This is Jericho's Road. Take the Other.
When the young Texas Ranger Andy Pickard is assigned to the Texas-Mexico border he learns the meaning of this ominous notice on the edge of a great tract of ranch land above the Rio Grande. It is Jericho Jackson's country and Jackson is at war with a similarly ruthless cattle baron on the Mexican side of the river, Guadalupe Chavez.
The two men are rustling each others' cattle, raiding and killing on both sides of the border, and heading for a bloody showdown-with the Texas Rangers standing between them.