Isn't this the same Guidry whose grave is marked as belonging to Co G Crescent Regiment?
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=guidry&GSfn=ovide&GSbyrel=all&GSdyrel=all&GSst=20&GScntry=4&GSob=n&GRid=16619264&df=all&