The Buffalo Soldiers
S2:E10
1968
IMDb
""A factual drama based on the 10th Cavalry, a Negro regiment formed in 1866. Lawlessness in Tucson brings martial law--and the 10th--into open conflict with the town's white populace and an army of outlaws. Members of the honorary 10th Cavalry, formed in Los Angeles in 1966, are featured in this episode."" (TV Guide)