After the Civil War, Waul was a farmer and lawyer who lived in Texas until his death at age 90.

[1][2] Waul made an unsuccessful run for a seat in the United States Congress in 1854.

[3] Waul then commanded a brigade in John G. Walker's Texas Division in the Confederate Trans-Mississippi Department.

[2][4][6] On April 30, 1864, after being transferred to Arkansas to oppose Union Major General Frederick Steele's Camden Expedition, Brigadier General Waul was wounded in the left arm at the Battle of Jenkins' Ferry.

[1][2][4][6] He returned to service in September 1864 and until December 1864 commanded Brigade I, Division I, I Corps of the Trans-Mississippi Department.

[1] From January 1865 to May 26, 1865, he commanded Brigade I, Division I, of the District of Texas, New Mexico, and Arizona in the Trans-Mississippi Department.

[2] After practicing law at Galveston, Waul retired to Hunt County, Texas, near Greenville, where he was a farmer on his property named Cherry Hill Plantation.