I can find very little on Charle's 11th La/49th USCTs except the brief references to them in Edwin Bearss Vicksburg work noted below.

The Official Records for their Mississippi period, 63/64 only presents them in two Tables of Organization.

I would suggest you might want to try some Goggle searchs, one of which I found re Millican's Bend awards, also noted below.

George Martin

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Charles B. Smith

Residence was not listed; 23 years old.

Enlisted on 4/22/1862 as a Private.

On 4/22/1862 he mustered into "D" Co. MN 4th Infantry
He was discharged for promotion on 8/16/1863

On 8/16/1863 he mustered into "I" Co. US CT 49th Infantry
He was discharged for disability on 6/11/1864 at Vicksburg, MS [Note - This was just after their second engagement at Millican's Bend]

On 3/15/1865 he mustered as a substitute into Veteran Reserve Corps 9th
He was discharged on 3/15/1866 at Washington, DC
(Estimated day of enlistment & discharge. Served in
Freeman's Bureau)

Promotions:
* Sergt 8/16/1863 (As of Co. I, 49th US CT Infantry)

Other Information:
born in Calais, ME

Buried: Olivet Cemetery, Cloverdale, CA

After the War he lived in California

Sources used by Historical Data Systems, Inc.:

- Minnesota in the Civil and Indian Wars 1861-65
- Prisoners who died at Andersonville: Atwater Report
- Information provided by HDS subscribers

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49th UC Infantry
( 3-years )
Organized: Milliken's Bend, LA on 7/1/63
Mustered Out: 3/27/66

Officers Killed or Mortally Wounded: 3
Officers Died of Disease, Accidents, etc.: 1
Enlisted Men Killed or Mortally Wounded: 59
Enlisted Men Died of Disease, Accidents, etc.: 464
(Source: Fox, Regimental Losses)

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NPS Soldiers & Sailors System

Charles B. Smith (First_Last)
Regiment Name 49 U.S. Col'd Inf.
Side Union
Company I
Soldier's Rank_In Sergt.
Soldier's Rank_Out Sergt
Alternate Name
Notes REFERENCE CARD. This man was temporarily attached to the organization named above. His cards are filed with the 4th Minn. Inf. (Co D) to which organization he belonged.
Film Number M589 roll 80
African American Civil War Memorial
Displayed as: Charles B. Smith
Plaque Number: C-62

UNITED STATES COLORED TROOPS

49th Regiment, United States Colored Infantry

Organized March 11, 1864, from 11th Louisiana Infantry (African Descent). Attached to 1st Colored Brigade, District of Vicksburg, Miss., to April, 1864. 1st Brigade, 1st Division, United States Colored Troops, District of Vicksburg, Miss., April, 1864. 2nd Brigade, 1st Division, United States Colored Troops, District of Vicksburg, Miss., to October, 1864. 1st Brigade, 4th Division, 16th Corps, to November, 1864. 1st Brigade, 1st Division, United States Colored Troops, District of Vicksburg, Miss., to June, 1865. Dept. of Mississippi to March, 1866.

SERVICE.-Post and garrison duty at Vicksburg, Miss., and at various points in the Dept. of Mississippi entire term. Mustered out March 27, 1866.

Predecessor unit:

LOUISIANA VOLUNTEERS

11th REGIMENT INFANTRY (AFRICAN DESCENT).

Organized at Milliken's Bend, La., May 23 to August 22, 1863. Attached to African Brigade, District of Northeast Louisiana, to July, 1863. Post Goodrich Landing, District of Vicksburg, Miss., to January, 1864. 1st Brigade, U. S. Colored Troops, District Vicksburg, to March, 1864.

SERVICE.-Duty at Milliken's Bend till January, 1864. Action at Milliken's Bend June 7. Post duty at Vicksburg, Miss., January to March, 1864. Expedition to Waterproof January 29-February 23. Waterproof February 14-15. Designation of Regiment changed to 49th U. S. Colored Troops March 11, 1864, which see.

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See:

Part XI, of Edwin Cole Bearss' in Vol. III, of Edwin Cole Bearss' three volume work on The Campaign for Vicksburg, pp. 1153-1206, The Trans-Mississippi Confederates Seek to Relieve Vicksburg, Chapter LIX, Defending the Louisiana Enclaves, notes the 11th Louisiana Infantry (African Descent) on three pages re the June 7, 1863 action at Millican's Bend, along with an Order of Battle, Operations in Northeast Louisiana, May 2 - July 7, 1863 which notes that the recently formed 11th lost 43 Killed, 119 Wounded, and 243 Missing,

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See also: http://www.millikensbend.org/