The Rifleman
The Vaqueros
S4 E1:
While Lucas and Mark are traveling across the Mexican desert they encounter a trio of Mexican bandits who demand payment to cross "their" desert. When Lucas refuses, the three slam him in the throat with his rifle, kidnap Mark, strip him of all his possessions, tie him to a tree and leave him to die of thirst and exposure.
Starring
Ziva Rodann, Martin Landau, Pepe Hern