Whakaotihia te rerenga e whai ake nei: I te wa i whakatuhia ai te New York State Agricultural College (i muri mai ka uru ki te Whare Wananga o Cornell) i Ovid, New York, ka noho a Kimball hei Ahorangi o te Hinu me te Taiao Taiao. I te pakarutanga o te Pakanga o Amerika i te tau 1861, ko te perehitini o te whare wananga, ko te Maj. M. R. Patrick i tohua hei Brigadier-General of Volunteers; I noho a Kimball hei Tumuaki o Brig. Gen. Patrick, me te taumata o te Kapene. I kite ia i te ratonga mara i raro i te Maj. Gen. Irvin McDowell, a i tae atu ia ki te Pakanga Tuarua o Bull Run (Akuhata 28-30, 1862);
Ko te Pakanga o Chantilly (Hepetema 1, 1862); te Pakanga o te Maunga ki te Tonga (Hepetema 14, 1862); te Pakanga o Antietam (Hepetema 17, 1862); te Pakanga o Fredericksburg (Hepetema 11-15, 1862); te Pakanga o Chancellorsville (Paenga-whawha 30-Mei 6, 1863); me te Pakanga o Gettysburg (Hurae 1-3, 1863). I reira ka tohua a Brig. Gen. Patrick hei Provost Marshal o te Army of the Potomac, a ka haere tahi a Kapene Kimball ki a ia ki reira, e mahi ana i runga i te General Staff i raro i nga General George B. McClellan, Ambrose Burnside, Joseph Hooker, me George Meade.