During World War II, the late Fehrenbach served with the US Infantry and Engineers as platoon sergeant with an engineer battalion. He continued his military career in the Korean War, rising from platoon leader to company commander and then to battalion staff officer of the 72nd Tank battalion, 2nd Infantry Division. Prior to his military involvement, a young T. R. Fehrenbach, born in San Benito, Texas, worked as a farmer and the owner of an insurance company. His most enduring work is Lone Star, a one-volume history of Texas. In retirement, he wrote a political column for a San Antonio newspaper. He sold numerous pieces to publications such as the Saturday Evening Post and Argosy. He is author of several books, including U.S. Marines in Action, The Battle of Anzio, and This Kind of War.