Mezue ahịrịokwu na-esonụ: Cowdin bụ onye ọchịagha nke 2nd Massachusetts Militia Regiment na mmalite nke agha ahụ, ma họpụta ya ka ọ bụrụ onye ọchịagha nke 1st Massachusetts Infantry na May 25, 1861. Ọ duru ndị agha ya n'agha nke Blackburn's Ford na July 18, 1861, bụ akụkụ nke Israel B. Richardson's brigade nke Daniel Tyler's Division na Agha Mbụ nke Bull Run, ebe e gburu ịnyịnya ya. Ọ hụkwara ọgụ na Williamsburg,
Fair Oaks, Glendale, Malvern Hill na Chantilly.