Mezue ahịrịokwu na-esonụ: Mgbe ọdịda nke Vicksburg gasịrị, e zigara ngalaba Osterhaus na Tennessee. N'agha Chattanooga, o nyeere Maj. Gen. Joseph Hooker aka n'iweghara
Ugwu Nche. Osterhaus sonyere na Atlanta Campaign mana ezumike ọrịa were otu ọnwa mere ka ọ ghara ịga agha dị mkpa nke Atlanta. Agbanyeghị, ọ laghachiri n'ọchịchị ma rụọ ọrụ dị mkpa na Agha nke Jonesborough. Mgbe e weghaara Atlanta, ọ natara iwu nke XV Corps, otu n'ime ndị agha anọ nke ndị agha jikọtara ọnụ, na Sherman's March to the Sea. Na Machị 1865 a họpụtara Osterhaus ka ọ bụrụ onye isi ndị ọrụ na Ngalaba ndị agha nke West Mississippi n'okpuru iwu nke Maj. Gen. Edward Canby, onye ọchịagha nwere obere ahụmịhe na-alụ ọgụ na ndị isi. Osterhaus jere Canby ozi n'agha nke Spanish Fort na Fort Blakely. Mgbe Edmund Kirby Smith nyefere ndị agha Confederate na Trans-Mississippi Theater, e zigara Osterhaus dị ka onye nnọchi anya Canby ma ya mere jiri aka ya bịanye aka na akwụkwọ ahụ n'aha ndị agha Union.