The Deserter - S4.E5

An Indian-hating officer, Colonel Edward J. Dunwoody, comes to the Ponderosa looking for army deserter Bill Winters, who is a good friend of the Cartwrights. Bill happens to be his son and is married to an Indian. It seemed Bill deserted when he was ordered to massacre the Shoshone, by poisoning their food and water, genocide. The Shoshone find out and abduct Bill's father.