Question: Wilhelm O. Philipsen served as blackmith in a historical unit of the United States Army, that began its service in the decade prior to what war?
Sentence (from "Wilhelm O. Philipsen"): Wilhelm O. Philipsen (1852–1913), a recipient of the Medal of Honor, served as a blacksmith in Company D of the U.S. Army’s 5th Cavalry Regiment during the Battle of Milk Creek in 1879.
Relevant evidence: Yes