Pvt. Peter E. McKittrick surrendered with his unit at Vicksburg in July/1863.
If this headstone is correct, he died in 1898.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=mckittrick&GSbyrel=in&GSdyrel=in&GSst=20&GScntry=4&GSob=n&GRid=10727398&
Hope this helps.