Rubuta ci gaba ga wannan sakin layi - Hexamer ya koma umurnin a cikin kaka na 1863. Batirinsa ya yi aiki a cikin Artillery Reserve a cikin Bristoe Campaign da Battle of Mine Run.
Ka yi haƙuri. A shekara ta 1864, batirin Hexamer ya ci gaba a cikin Artillery Reserve a cikin Kamfen na Overland har zuwa yakin Cold Harbor, lokacin da aka sanya shi zuwa VI Corps. Batirin ya goyi bayan hare-haren da sojojin Union suka yi a Cold Harbor. Baturi ya kasance tare da VI Corps a farkon matakai na Siege na Petersburg.