At fold3.com (some records show him as "Michael W.")-

Muster-out roll, December 15, 1864: "Last paid to Aug 31, 1862."
"Deserted while on the march to Perryville Ky Oct 8 1862."

Record and Pension Office, War Dept., Washington, DC, November 23, 1896:
"Application for removal of the charge of desertion and for an honorable discharge has been denied."