The High Chaparral - Season 1 Episode 10 Sudden Country

Mistakes of an inexperienced eastern bank clerk who attempts to settle on a ramshackle ranch near the Cannon family threaten to wipe out the cattle industry of the territory. When Creed and Meg Hallock make repeated mistakes, John Cannon sends Buck, Billy Blue and Manolito to help them survive. Creed buys a non-existent herd and is swindled again when he innocently purchases diseased Mexican cattle. John ruins the greenhorn financially when he orders the cattle killed before they can infect other animals.