According to N.O.C. Vol 5 page 85; George Offutt was wounded at Port Gibson, captured at Vicksburg, and imprisoned until the end of the war.  He and his wife moved to Kansas and California.
Probably a Confederate Civil War veteran. The Battle at Port Gibson was one of a series that took place during the campaign to capture Vicksburg.  Vicksburg was under attack by the Union Army from Autumn of 1862 through 4 Jul 1863 when it fell.  Battle at Port Gibson after 30 Apr 1863, before 1 May 1863.
Believe after looking at Missouri information again that this George W. Offutt is in fact the George W. Offutt who served as a member of the 6th Missouri Infantry under Capt. Clark in Company G.  He apparently also was a member of the Missouri State Guards 1st Rifles.  Research in the National Archives Branch Library in Kansas City, MO found an index card in Microfilm M380 Roll #11 for George W. Offutt, a private in the 6th MO Infantry.  Also found were two cards in the microfilmed records of the Missouri Adj. General.
Missouri Soldiers (1861-1865) War Between The States
Surname:  Offutt     Given name: George W. (Age 22)     Rank: Pvt
Service:  Co. "G" 6th Mo. Inf, Regt. Vol    Capt. Clark
Date Enlisted: Jan 23, 1862     Place or Department: Springfield, Mo
Confirmation of Record:
Served in M.S.G. 1st Rifles.
Battles in :_ Corinth, Baker's Creek, Ga-Camp. 1864
Allatooona
Muster Roll on file Adj. Gen Office in Jefferson City, Mo.
Nat.: Scott Co., KY
Res.: Platte Co., Mo
2nd Card
Missouri Soldiers (1861-1865) War Between The States
Surname:  Offitt     Given name: George           Rank: Pvt
Service:  6th Mo. Inf            
Confirmation of Record:
"Bevier" (1879)  Appendix page-21
List of Survivors of 1st and 2nd Mo. Brigades with present residences and occupation.
Coffey Co., KA.