Thanks for your reply... I guess this is where my confusion has come from. My Grt-Grandfather's pension application definitely said "Cavalry." After the earlier post, I googled Major Edwards and got this:

"Edwards, N. S.,Capt. Co. B ( "Edward's Guards"), 16th La. Inf. En. Sept. 29, 1861, Camp Moore, La. Roll to Oct. 31, 1861, Absent on 36 hours' furlough. Present on Rolls from Dec., 1861, to Feb., 1862. Roll for May and June, 1862, Exempted by the Conscript Law. Roster dated March, 1865, Elected Capt., Aug. 22, 1861. Left out at reorganiation; over-age; successor, Samuel A. Hayden.

Major Nicholas S. Edwards, after being discharged from regular Confederate Service, later commanded "Edward's Battalion" of Louisiana State Militia. They were called into service under the command of C.S.A. Colonel James Wingfield to oppose a Federal Invasion of Eastern Louisiana in late 1864" ... at the following link: http://users.cnnw.net/rebcav/south/PS18/PS18_023.htm

I have been able to find the names of several men,or rather graves, who served in the "Battalion", via a google search. But still nothing more on the actual service of that particular unit.

I know smaller units were often incorporated into other units. Could this have happened?