Post war photo with wife at:

http://www.penandsaber.com/grays28th/sims.html

See also:
http://www.penandsaber.com/grays28th/
http://www.penandsaber.com/grays28th/mcfarlands28th.html
http://search.yahoo.com/search?p=28th+Louisiana+Infantry&ei=UTF-8&fr=clearspringsf

James Lindsey Sims, 35 year old Farmer, born in Shelby County, Ala., 2nd Sergeant, Company F, 28th (Gray's) Louisiana Infantry (Jackson Volunteers), enlisted May 5, 1862 at Vernon, La. for 3 years or the war, recorded on the July/Aug., 1863 muster as absent without leave, rank Private, admitted CSA Gen. Hosp., Shreveport, La. April 18, 1864, Diarrhoea, paroled at Natchitoches, La. June 13, 1865, resident of Jackson Parish, La.

M320: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Louisiana

I believe they may have manned a gun here:

1/3/63 Portion of the 28th (companies F and G) detached at Fort burton at Butte la Rose on the Atchafalaya ( along with the Cresant rgimant), repulsed gunboat "Diana."