The 29th Texas Cavalry was organized in July 1862 by Clarksville, Texas, newspaper publisher Charles DeMorse, who served as its colonel. In March 1863, Colonel DeMorse received orders to move the regiment to Indian Territory to join Brigadier General Douglas H. Cooper's Mounted Indian Brigade. The regiment took part in an attack on the Fort Scott-Fort Gibson supply train at Cabin Creek on July 1-2, 1863, and then assembled at Honey Springs, where it faced its first major engagement. In that fighting, skirmishers on both sides kept up constant fire, the enemy advanced in line of battle along the entire front with rapid small-arms fire, and after holding fire until the enemy came within 20 yards, the regiment fired on them before falling back as the right gave way and the enemy moved rapidly to the rear, forcing the men, cut off from their horses and main command, to make their way on foot up Elk Creek and then to North Fork. The 20th Texas Cavalry was organized by Colonel Thomas Coke Bass in the late spring of 1862. Before Honey Springs, it fought at Prairie Grove, Arkansas. In early November 1862, the regiment was dismounted and served the rest of the war as foot soldiers. In battle, after Federal forces crossed the river, drove in the pickets, and marched to the creek where the regiment was camped, the men formed on the north side of the creek under cannon fire and grape, held their fire until the enemy came within forty yards, then opened fire, but the Texans were driven back as bullets came faster than they had ever seen before.