Rio Grande

In the summer of 1879, "fifteen years after the Shenandoah", Lieutenant Colonel Kirby Yorke (Wayne) is posted on the Texas frontier with the 2nd U.S. Cavalry Regiment to defend settlers against attacks by marauding Apaches. Yorke has just captured the Aoache's leader. Heis under considerable pressure due to the Apaches using Mexico as a sanctuary from pursuit, and by a serious shortage of troops in his command.