Had William O. Barger or his spouse filed for a Confederate Pension it would be in Oklahoma rather than Mississippi. William O. Barger died 3 years before OK began granting Confederate pensions and his spouse does not appear in the Oklahoma Index.

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=barger&GSfn=w&GSbyrel=in&GSdyrel=in&GSst=38&GScntry=4&GSob=n&GRid=30088147&