Tuhia he haere tonu mo tenei whitianga - I noho a Mann i te hotoke i muri mai i te tari whakauru a te ope taua o Chicago; i tukuna nga kaimahi ki te whakakii i nga rarangi o te 39th. I te tau 1864 i whakawhiwhia te puhi ki te ope taua a James i raro i te rangatira a Colonel Thomas O. Osborn. I riro i a Mann nga mahi a Osborn i muri i tana whara i te Pakanga o Drewry's Bluff
He aha? I whakatere te 39 ki tetahi tuunga paruru o te Rōpū me te hopu i tetahi rangatira rangatira. Mo ana mahi, ko Mann tonu i whakawhiwhia ki a ia hei rangatira pirihimana.