Whakaotihia te rerenga e whai ake nei: I te wa i whakakorea ai te III Corps, i whakawhitihia te papahiko a Clark ki te Reserve Artillery i roto i te parirau o Major John A. Tompkins. I roto i taua hanganga, i mahi te papahiko a Clark i nga pakanga tuatahi o te pakanga o Overland. I te wa o te Pakanga o Cold Harbor, i whakawhitihia te papahiko a Clark ki te pereki puhipuhi o te II Corps i raro i a Colonel John C. Tidball. I te whakapae o Petersburg, i noho tonu te papahiko a Clark ki te II Corp i raro i a Tidball, katahi ka noho ki raro i a Colonel John G. Hazard. I whara ohorere a Clark i te
Te Pakanga Tuarua o Ream's Station i te tau 1864. I muri mai, i whakahaeretia e ia nga hoia i roto i tana paparanga kua pau nei o raatau rehitatanga ki Trenton, New Jersey, i mua i te hokinga ki te taha o Petersburg. I hoki mai ki Petersburg, ko Clark te rangatira o te pu i runga i nga raina o mua o te II Corps i te marama o Tihema 1864.