Whakaotihia te rerenga e whai ake nei: I te hotoke o te tau 1861-62, i uru a Willson ki te tiaki i te Raina Raina o Baltimore me Ohio me nga pakanga i Virginia i raro i nga rangatira o Nathaniel Banks me John Pope. I whawhai ia i te Pakanga o Antietam, i te Mahuru 17, 1862. I te Mei 5, 1863, i whara kino ia i te Pakanga o Chancellorsville Virginia. Kaore ia i hoki mai ki te mahi tae noa ki te Mahuru 1863 i raro i a General Joseph Hooker i te wa i neke ai te XI me te XII Corps o te Army of the Potomac ki te hauauru ki te whakakaha i te Army of the Cumberland huri noa i Chattanooga, Tennessee. I reira i uru a Willson ki nga pakanga o Wauhatchie,
Ko Lookout Mountain, ko Missionary Ridge, ko Peavine Creek, ko Ringgold Gap.