It was still the 23rd Arkansas Infantry, just changed from serving in the Department of Mississippi and East Louisiana to serving in the Department of the Trans-Mississippi.
23rd Regiment, Arkansas Infantry
23rd (Lyles') Infantry Regiment, originally C. W. Adams' 23rd Regiment, was organized at Helena, Arkansas, during the spring of 1862. Its members were from the counties of Graighead, Phillips, St. Francis, Monroe, Cross, Poinsett, and Chicot. The unit fought in the conflicts at Corinth and Hatchie Bridge and reported 5 killed, 23 wounded, and 116 missing. Later it was assigned to General Beall's Brigade, Department of Mississippi and East Louisiana. In April, 1863, it was united with Powers' 14th and Crockett's 18th Arkansas Regiments, and in July was captured at Port Hudson. After being exchanged and mounted, the regiment served in the Trans-Mississippi Department and took an active part in Price's Missouri Expedition. It surrendered on May 16, 1865, near Memphis, Tennessee. The field officers were Colonel Oliver P. Lyles, and Lieutenant Colonels Erastus L. Black and A. H. Pennington.