26 Men S02 E37 Abandoned

One of Kelton's riders reports that his son has been abducted by a group of Apaches led by Cochise himself. Rynning quickly organizes a posse to pursue the renegades, but their rescue mission is dogged by misfortune and, eventually, murder. The rangers begin to suspect that a member of their posse is in cahoots with the abductors, who may not be Indians after all.