Mezue ahịrịokwu na-esonụ: Hexamer laghachiri na iwu na ọdịda nke 1863. Batrị ya jere ozi na Reserve Artillery na Bristoe Campaign na
Agha nke Ọgba Mgba. N'afọ 1864, batrị Hexamer gara n'ihu na Reserve Artillery na Overland Campaign ruo mgbe Agha nke Cold Harbor, mgbe e kenyere ya na VI Corps. Batrị ahụ kwadoro mwakpo ndị agha Union dara na Cold Harbor. Batrị ahụ nọgidere na VI Corps na mmalite nke Siege nke Petersburg.