From Booth's records:

Watson, William, Ord. Sergt. Pvt. Co. K, 3rd La. Inf. En. New Orleans, La., May 17, 1861.
Present on Rolls to Aug. 31, 1861. Roll Sept. and Oct., 1861, Absent, sick, in Hospl. Roll Nov.
and Dec., 1861, Present or absent not stated. On Roll for Jan. and Feb., 1862, without remarks.
Roll May and June, 1862, Present, 1st Sergt. up to May 23, 1862. Roll July and Aug., 1862,
Discharged July 19, 1862, by reason of an Act of Congress, approved April 16, 1862.