1 8 3 9 ▁– ▁ 3 1 ▁October ▁ 1 9 2 5 ) ▁was ▁a ▁French - born ▁sculpt or , ▁newspaper ▁publish er ▁and ▁soldier ▁who ▁served ▁in ▁the ▁Franco - A ust rian ▁War ▁and ▁American ▁Civil ▁War . ▁Ag n us ▁studied ▁as ▁a ▁sculpt or , ▁before ▁en list ing ▁to ▁fight ▁in ▁the ▁Franco - A ust rian ▁War . ▁Upon ▁conclusion ▁of ▁the ▁war , ▁he ▁travel led ▁to ▁the ▁United ▁States , ▁and ▁briefly ▁worked ▁as ▁a ▁sculpt or . ▁In ▁ 1 8 6 1 , ▁upon ▁the ▁out break ▁of ▁the ▁American ▁Civil ▁War , ▁Ag n us ▁en list ed ▁in ▁the ▁ 5 th ▁New ▁York ▁Vol unte er ▁Infantry , ▁and ▁served ▁with ▁mer it , ▁rising ▁to ▁bre vet ▁brig ad ier - general ▁before ▁being ▁must ered ▁out ▁of ▁service . ▁Ag n us ▁was ▁then ▁inspect or ▁general ▁of ▁the ▁Department ▁of ▁the ▁South ▁and ▁super vised ▁the ▁dis m ant ling ▁of ▁ ▁Confeder ate ▁for ts . ▁ ▁After ▁the ▁war , ▁Ag n us ▁settled ▁in ▁Baltimore , ▁and ▁worked ▁for ▁the ▁Baltimore ▁American , ▁eventually ▁rising ▁to ▁publish ▁the ▁paper . ▁Charles ▁F ult on , ▁the ▁previous ▁publish er , ▁was ▁his ▁father - in - law , ▁Ag n us ▁having ▁married ▁F ult on ' s ▁daughter ▁An nie ▁on ▁ 1 3 ▁December ▁ 1 8 6 4 . ▁As ▁the ▁publish er , ▁Ag n us ▁was