The regiment fought at the Battle of Mansfield on 8 April 1864 and at the Battle of Pleasant Hill the following day. Taylor had 9,000 troops available at Mansfield. He deployed Walker's division on the right and Alfred Mouton's division on the left, with cavalry covering both flanks. The Union army of Nathaniel P. Banks had at least 20,000 soldiers, but they were strung out in a long column. After Mouton's division charged the Federals and overwhelmed their opponents, Walker's division also attacked, completing the rout. Of 12,000 Union troops engaged, 2,235 became casualties and the Confederates captured 20 guns and 200 wagons. Confederate casualties were less than half of the Federal loss. That evening, Taylor was reinforced to 12,500 men and he attacked the next day at Pleasant Hill. Walker's division was ordered to hold the Union army in front while Thomas James Churchill's infantry attacked on the right and Tom Green's cavalry went forward on the left. Mouton's division, now under Camille Polignac (Mouton had been killed), was in reserve. Churchill's troops enjoyed initial success but were soon driven back by veteran Union troops under Andrew Jackson Smith. Walker was badly wounded and the action was a tactical defeat for the Confederates. The Union army sustained 1,369 casualties while the Confederates lost 1,626. Nevertheless, Banks abandoned the Red River campaign and retreated.