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 "5th Cavalry Regiment"): The 5th Cavalry Regiment ("Black Knights") is a historical unit of the United States Army that began its service in the decade prior to the American Civil War and continues in modified organizational format in the U.S. Army.
Relevant evidence: Yes