 Nyorai kupfuurira kweiyi ndima - Muna April 1863, akasimudzirwa kuva brigadier general, achidzokera shure kuna November 29, 1862. Wagner akarayira 21st brigade panguva yeMaj. Gen. William S. Rosecranss basa reChattanooga, Tennessee, munaGunyana 1863. Boka raWagner rechi 21 rakachengetwa seboka revarwi muChattanooga panguva yehondo yeChickamauga. Varume vake vakarasikirwa zvikuru pakurwiswa kweMishinari Ridge panguva yeChattanooga Campaign. Wagner akanga achishanda zvakare mu1864 Atlanta Campaign, achitungamirira 2nd brigade mu IV Corps, iyo yakatambura kurasikirwa kwakanyanya zvakanyanya muhondo yeKennesaw Mountain, uye rimwe boka munguva yeFranklin-Nashville Campaign. 