Bonanza (1959)

S12E23 Terror at 2:00

A bigoted man and his accomplices hijack a Gatling gun, intending to slaughter everyone, including the Cartwright family, present at a peace treaty signing between the U.S. Army and the Paiutes in Virginia City. His twisted ambition is to incite chaos and reignite war, ultimately aiming for the extermination of all Native Americans.