During the war, Soule joined the
Confederate States Army, in 1862, going to the front as captain of Company A,
Crescent Regiment of Louisiana Volunteers, commanded by Col. Marshall J. Smith. Soule served with the Army of the Tennessee and the Trans-Mississippi Department. On the second day of the great
Battle of Shiloh, on April 7, 1862, he was wounded and captured, was sent to prison on
Johnson's Island in
Lake Erie, and exchanged at Vicksburg September 17, 1862. The Crescent Regiment, originally mustered for ninety days, was reorganized in the fall of 1862 with Soule as major. On the death of Lieut. Col. G. P. McPheeters at Labadieville, October 27, 1862, Soule succeeded to the rank of lieutenant colonel, and with the reorganized regiment he participated in all the engagements on the
Bayou Teche, at
Berwick Bay, the
Battle of Fort Bisland, and others until November 3, 1863, when the regiment was united with the Confederate Guards, Response Battalion and the Eighteenth Battalion to form the consolidated Crescent Regiment. He was then temporarily assigned to post duty and later appointed by Gen. E. Kirby Smith as chief of the Labor Bureau District of Western Louisiana. There he served until June 9, 1865, when he was paroled from service. ==Educational career==