"Joseph Lancaster Brent: Lawyer, Warrior and Prophet of Tank Warfare," in Hewitt and Schott, Confederate Generals in the Trans-Mississippi, Volume 2, (Knoxville, 2015), pp. 221-244; Official Records, Army, volume 11, part 3, pp. 575-576, 615; Joseph L. Brent, Memoirs of the War Between the States, (New Orleans, 1940), 182-183, 188; Joseph L. Brent, Mobilizable Fortifications and Their Controlling Influence in War, (1885; reprint, Baltimore, 1916). That should get you started.