This may be the guy - Source is Listing of CMOH Winners (http://www.cmohs.org/recipient-detail/1249/simmons-william-t.php) . Captured the 34th Alabama Flag

SIMMONS, WILLIAM T.
Rank: Lieutenant
Organization: U.S. Army
Company: Company C
Division: 11th Missouri Infantry
Born: 29 January 1843, Green County, Ill.
Place / Date: At Nashville, Tenn., 16 December 1864
CitationCapture of flag of 34th Alabama Infantry (C.S.A ). Being the first to enter the works, he shot and wounded the enemy color bearer.