Mezue ahịrịokwu na-esonụ: Mgbe Agha Obodo ahụ malitere, a họpụtara Osterhaus ka ọ bụrụ onye isi nke ndị agha na-ahụ maka ndị ọrụ afọ ofufo nke Missouri nke abụọ ma n'afọ mbụ nke agha ahụ, e were ya n'ọrụ na Missouri na Arkansas, ebe o weere akụkụ dị ịrịba ama na Agha nke Wilson's Creek na Agha nke Pea Ridge. Na Pea Ridge o nyere ndị agha nke mbụ kọntaktị na ndị agha Confederate na-aga n'ihu na Union aka ekpe. E buliri ya n'ọkwa Brigadier General na June 9, 1862. N'afọ 1863 o duziri otu ngalaba na
Agha nke Port Gibson, ebe o gosipụtara ikike ịkpa oke n'ime ndị na-agbachitere Confederate site n'ọnọdụ dị mma.