Tuhia he haere tonu mo tenei waahanga - I te Mei 1861 i hoki mai ia ki te mahi hoia a te US hei 1st Lieutenant i te 1st US Cavalry Regiment. He mema ia o te ratonga Kaitaere auau tae noa ki tana whakataunga hei Koronela o te 1st Massachusetts Volunteers Infantry Regiment. I roto i tenei kaha i whawhai ia i Fredericksburg, Chancellorsville, Gettysburg, Mine Run
, Te Moana me te Spotsylvania. I whakawhiwhia e ia nga whakatairanga mo te rangatira i te US Army mo Chancellorsville me te koromatua mo Gettysburg. I whakauruhia ia ki waho o te ratonga o nga kaihauturu i te Mei 28, 1864.