James Arness, Bruce Boxleitner, Fionnula Flanagan. Title from web page. Originally broadcast on ABC in 1978.
Summary:
Life in the Colorado wilderness tests the Macahans to the limit in the gripping second season of one of the most epic TV Westerns of all time. Hardened mountainman and patriarch Zeb gets caught in the middle of a war between the Sioux tribe and the U.S. Army, while fugitive son Luke comes across a lethal gang of ex-Confederate gold robbers while on the run. Aunt Molly Culhane joins the family, bringing Irish grit and heart to the homestead.
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