Rubuta ci gaba ga wannan sakin layi - Mann ya yi amfani da hunturu na gaba a ofishin Chicago Union Army recruiting; An aika da sababbin shiga don cika matsayi na 39th. A shekara ta 1864 an sake sanya rundunar zuwa rundunar sojojin James karkashin Colonel Thomas O. Osborn. Mann ya ɗauki nauyin Osborn bayan da aka ji rauni a yakin Drewry's Bluff
Ka yi haƙuri. 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.