Mezue ahịrịokwu na-esonụ: Mgbe e kpochapụrụ III Corps, a kpọfere batrị Clark na Reserve Artillery na brigade nke Major John A. Tompkins. N'usoro ahụ, batrị Clark jere ozi n'agha ndị mbụ nke Mgbasa Ozi Overland. Ka ọ na-erule oge Agha Cold Harbor, ebufere batrị Clark na ndị agha nke II Corps n'okpuru Ọchịagha John C. Tidball. Na Siege nke Petersburg, batrị Clark nọgidere na II Corp n'okpuru Tidball na mgbe ahụ n'okpuru Colonel John G. Hazard. E merụrụ Clark ahụ n'ụzọ dị mfe n'ọgbọ agha ahụ.
Agha nke Abụọ nke Ream's Station n'afọ 1864. Mgbe e mesịrị, ọ kpọghachiri ndị agha nọ na batrị ya, ndị akwụkwọ ha agwụla, na Trenton, New Jersey, tupu ha alaghachi n'ihu Petersburg. Mgbe ọ laghachiri na Petersburg, Clark bụ onye na-elekọta ndị agha na-ebu agha n'ihu nke II Corps na December 1864.