Organized March 11, 1864, from 4th Mississippi Infantry (African Descent). Attached to Post of Goodrich Landing, District of Vicksburg, Miss., Depts. of the Tennessee and Mississippi, to February, 1865. Little Rock, Ark., Unattached, 2nd Division, 7th Corps, Dept. of Arkansas, to February, 1865. Unattached, District of Vicksburg, Miss., and Dept. of Mississippi, to March, 1866.

SERVICE.--Post and garrison duty at Goodrich Landing and at Lake Providence, La., till February, 1865. Actions at Issaqueena County March 22, 1864. Goodrich Landing March 24. Bayou Mason July 2. Issaqueena County July 10. Goodrich Landing July 16. Bayou Tensas July 30. Issaqueena County August 17. Bayou Tensas August 26. Post and garrison duty at Little Rock, Ark., till March, 1865, and at Vicksburg, Miss., and in the Dept. of Mississippi till March, 1866. Mustered out March 20, 1866.

Predecessor unit:

MISSISSIPPI VOLUNTEERS.
4th REGIMENT INFANTRY (AFRICAN DESCENT).
Organized at Vicksburg, Miss., December 11, 1863. Attached to post and District of Vicksburg, Miss., to March, 1864. Post Goodrich Landing, District of Vicksburg March, 1864.

SERVICE.--Post duty at Vicksburg and at Goodrich Landing, till March, 1864. Skirmish at Columbia February 4, 1864. Designation of Regiment changed to 66th U.S. Colored Troops March 11, 1864 (which see).