I te timatanga o te pakanga, i mahi ia i roto i ngā tūranga kaimahi rerekē, i mua i te riro i te koroneela me te rangatira-o-te kaimahi o te ope o Virginia i raro i te General John Pope, i reira i kite ia mahi i roto i te Battle o Cedar Mountain, te Tuarua Battle o Bull Run, me te Battle o Chantilly
He aha? I muri mai ka mahi ia hei kaiawhina mo nga kaimahi o te ope taua o Potomac, i uru ki nga pakanga o South Mountain me Antietam. I te marama o Tihema 1862, i tukuna ia ki te mahi kaimahi i Washington, DC. I te Hui-tanguru 1865, i whakaingoatia ia hei kaitiaki o te ope taua o te Potomac i raro i a General George Meade, a i uru ia ki te Pakanga o Hatcher's Run.