Kammala jumla mai zuwa: Mann ya shafe hunturu na gaba a ofishin daukar ma'aikata na Chicago Union Army; an aika da sabbin ma'aikata don cika matsayin na 39. A shekara ta 1864 an sake sanya rundunar zuwa rundunar sojojin James karkashin Colonel Thomas O. Osborn. Mann ya dauki nauyin aikin Osborn bayan da ya ji rauni a
Yaƙin Drewry's Bluff. Na 39th ya ci gaba da ci gaba da matsayi na kariya na Confederate kuma ya kama wani brigadier janar. Saboda ayyukansa, Mann da kansa ya zama janar janar.