Whakaotihia te rerenga e whai ake nei: I hoki mai a Hexamer ki te whakahau i te ngahuru o te tau 1863. I mahi tana pū i roto i te Reserve Artillery i te Campaign Bristoe me te
Ko te Pakanga o Mine Run. I te tau 1864, i haere tonu te puhiko a Hexamer i roto i te Reserve Artillery i te Overland Campaign tae noa ki te Pakanga o Cold Harbor, i te wa i tohaina ai ki te VI Corps. I tautokohia e te papahiko nga whakaeke i rahua o te ope a te Uniana i Cold Harbor. I noho tonu te Pūhiko ki te VI Corps i nga waahanga tuatahi o te Siege o Petersburg.