Whakaotihia te rerenga e whai ake nei: I te pakarutanga o te Pakanga a-Rohe, i tohua a Brooks hei rangatira rangatira mo nga kaitohutohu i te marama o Hepetema 1861. I whakahau ia i te 2nd Brigade, 2nd Division o te IV Corps i te Peninsula Campaign, me te 2nd Brigade, 2nd Division o te VI Corps i nga Pakanga e whitu nga Ra, i reira ia i whara ai i te
Te Pakanga o te Teihana o Savage. I te whakaoranga, ka hoki ano ia ki te whakahau i tana pereti mo te Whakatairanga o Maryland ka arahi i ana tangata ki Crampton's Gap, i reira i mau ai i a raatau he haki whawhai Confederate no te 16th Virginia Infantry. I te Pakanga o Antietam, ko te brigade a Brooks i te nuinga o te rahui, ahakoa i raro i te "whatu o te pupuhi me nga kaitirotiro" mo nga haora 48.