Gunsmoke S17E17 - Hidalgo

Mando is an outlaw in Mexico who seriously wounds Matt and leaves him to die in the desert. Hidalgo controls nearly all of the small town where Matt finds refuge, and nobody will stand up to him. Matt is determined to kill or capture Hidalgo for his crimes, but is so weak from his injuries he has to prop himself upright with the saddle horn of his horse.