The 15th Texas Cavalry Regiment was a unit of cavalry volunteers mustered into the Confederate States Army in March 1862 and fought during the American Civil War. In July 1862 the unit was dismounted and served the remainder of the war as infantry. The regiment was captured at Arkansas Post in January 1863. After being exchanged three months later, the much-reduced 15th Texas was consolidated with two other regiments and assigned to Patrick Cleburne's division in the Army of Tennessee. The consolidated regiment fought at Chickamauga, Missionary Ridge, and Ringgold Gap in 1863. After a re-consolidation, the regiment fought in the Atlanta Campaign, and at Franklin and Nashville in 1864. After a final consolidation the troops fought at Averasborough and Bentonville in 1865. The regiment's 43 surviving soldiers surrendered to Federal forces on 26 April 1865.

The Battle of Arkansas Post, also known as Battle of Fort Hindman, was fought from January 9 to 11, 1863, near the mouth of the Arkansas River at Arkansas Post, Arkansas, as part of the Vicksburg Campaign of the American Civil War. Confederate forces had constructed a fort known as Fort Hindman near Arkansas Post in late 1862. In December of that year, a Union force under the command of Major-General William T. Sherman left for an expedition against Vicksburg, without Major-General John A. McClernand because neither Major-Generals Henry Halleck nor Ulysses S. Grant trusted McClernand. After Sherman's force was repulsed at Chickasaw Bayou, McClernand arrived and took command from Sherman in January 1863.