Their True Faith and Allegiance is a book written by Gustavus Ohlinger in 1917. The book is a historical account of the American Civil War, focusing on the experiences of soldiers from Pennsylvania. Ohlinger was a veteran of the war himself, having served as a sergeant in the 67th Pennsylvania Infantry. The book is divided into two parts. The first part provides an overview of the Civil War, including the causes of the conflict, the major battles,...