During the American Civil War, nearly 320,000 Ohioans served in the Union Army, more than any other Northern state except New York and Pennsylvania. Of these, 5,092 were free blacks. Ohio had the highest percentage of population enlisted in the military of any state. Sixty percent of all the men between the ages of 18 and 45 were in the service. Ohio mustered 230 regiments of infantry and cavalry, as well as 25 light artillery batteries and 5 independent companies of sharpshooters. Total casualties among these units numbered 35,475 men, more than 10% of all the Buckeyes in uniform during the war. There were 6,835 men killed in action, including 402 officers.
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