Did not find his name on the Fold3 roster, see:
http://www.fold3.com/browsemore/83914448_/

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Could this be he?

A. C. Robertson, Private, Company A, 2nd Regiment Louisiana Infantry,* enlisted May 9, 1861 at Camp Walker/New Orleans, La. by Capt. Frazer, for one year, died of disease in Williamsburg, Vs. December 25, 1861

* This company was successively designated as Company A, Company H, and Company E, 2nd Regiment Louisiana Infantry

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

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For history of regiment, see:

http://www.acadiansingray.com/2nd%20Regt.%20Inf.htm
http://www.google.com/search?client=safari&rls=en&q=2nd+Louisiana+Infantry&ie=UTF-8&oe=UTF-8