▁regiment . ▁He ▁served ▁in ▁Texas , ▁and , ▁after ▁att aining ▁the ▁rank ▁of ▁lieutenant - col onel , ▁was ▁ordered ▁east wards ▁to ▁join ▁the ▁ 1 9 th ▁Corps . ▁He ▁served ▁under ▁General ▁Philip ▁Sher idan , ▁taking ▁part ▁in ▁the ▁batt les ▁of ▁O pe qu on , ▁Fish er ' s ▁Hill , ▁Win chester , ▁and ▁C ed ar ▁Creek . ▁His ▁last ▁service ▁was ▁in ▁the ▁Department ▁of ▁the ▁South , ▁as ▁inspect or ▁general ▁of ▁the ▁Department , ▁where ▁he ▁was ▁commission ed ▁to ▁dis m ant le ▁old ▁Confeder ate ▁for ts ▁in ▁South ▁Carolina , ▁Georgia , ▁and ▁Florida , ▁and ▁turn ▁all ▁the ▁property ▁over ▁to ▁the ▁U . S . ▁government . ▁He ▁received ▁the ▁bre vet ▁of ▁brig ad ier - general ▁of ▁volunte ers ▁on ▁ 1 3 ▁March ▁ 1 8 6 5 , ▁making ▁him ▁the ▁young est ▁brig ad ier - general ▁in ▁the ▁army ▁at ▁the ▁time . ▁Ag n us ▁was ▁must ered ▁out ▁of ▁service ▁on ▁ 2 2 ▁August ▁ 1 8 6 5 . ▁ ▁Later ▁life ▁and ▁death ▁On ▁res uming ▁civil ▁life ▁he ▁was ▁appointed ▁to ▁assistant ▁ass essor ▁in ▁the ▁In ternal ▁Re venue ▁Service ▁office ▁in ▁Baltimore . ▁He ▁worked ▁for , ▁and ▁was ▁eventually ▁given ▁charge ▁of ▁the ▁business ▁department ▁of ▁the ▁Baltimore ▁American ▁on ▁ 4 ▁July ▁ 1 8 6 9 , ▁and ▁later ▁became ▁its ▁publish er . ▁Ag n us ▁helped