A Pennsylvania-born historian and fiction writer, he is best known for his 1966 work, The Devil's Brigade, which was written in collaboration with Colonel George Walton and focused on the 1st Special Service Force, a combined American and Canadian military unit that fought in World War II. The work was adapted into a 1968 motion picture.
A member of the Army Air Corps, he flew thirty-seven missions over Europe during World War II.
His second World War II-themed book, Rome Fell Today, was published in 1968.
He had two children with his wife, Marjorie Ellen Lincoln. The couple lived in Pennsylvania for a time before moving to California and, later, Oregon.
His bestselling book, The Devil's Brigade, was made into a film starring William Holden.