Rubuta ci gaba don wannan sakin layi - A watan Mayu 1861 ya koma aikin soja na Amurka a matsayin 1st Lieutenant a cikin 1st US Cavalry Regiment. Ya kasance wani ɓangare na sabis na Cavalry na yau da kullum har sai an nada shi Colonel na 1st Massachusetts Volunteers Infantry Regiment. A wannan matsayin ya yi yaƙi a Fredericksburg, Chancellorsville, Gettysburg, Mine Run
, Dajin daji da kuma Spotsylvania. Ya sami ci gaba da ci gaba da ci gaba a cikin rundunar sojan Amurka don Chancellorsville da kuma Lieutenant Colonel na Gettysburg. An cire shi daga aikin sa kai a ranar 28 ga Mayu, 1864.