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After having lived in Mexico for the previous two decades, Factor and other Black Seminoles joined the US Army as Seminole-Negro Indian Scouts in August 1870, and served in the Red River War. On April 25, 1875, he was serving as a private by the Pecos River in Texas where, "[w]ith 3 other men, he participated in a charge against 25 hostiles while on a scouting patrol." A month later, on May 28, 1875, Factor was awarded the Medal of Honor for his actions during the engagement. Two of the other men who took part in the charge, Isaac Payne and John Ward, both Black Seminoles, also received Medals of Honor.