Not very many since the war didn't get started until April 1861.
approximately 5.5 million troops served in the Civil War. About 620,000 of them died
during the time 2% of the population died in the civil war
618,000 to about 700,000 soldiers died in the Cvil War
The civil war lasted about 4 years 1861-1865
From 1861 to 1865.
The union had many troops no one knows the exact amount!
General McClellan, in 1861, recommended that 20,000 troops were needed to defend Washington DC. With other troops stationed in the vicinity , additional reinforcements could be rapidly sent to the defense of the capitol.
About five - if we take the estimated 3 million slaves who were in service in 1861, and the estimated 600,000 soldiers on both sides who died in the war.
Over 258,000 Confederates, and 359,000 union troops died in the war. Most died from diseases like measles and dysentary.
Although the Union ad wonthe Civil War (1861-1865) they had about 110.070 soldiers die from battle . They had about 360,222 die in all (250,152 men died from disease).
Approximately 2.5 million to 2.75 million Union troops served in the American Civil War.
The Civil War lasted four years. From 1861 to 1865.