The garrison of Fort Sumter was of 80 men.
Based on all the history about Fort Sumter, it seems that there were no deaths associated with the battle of Fort Sumter.
There were only approximately 80 people on the union side and 500 on the confederacy
Sumeter was mainly a shelling of the fort until the Union unit stationed there surrendered. There were 80 men on the Union side and 500 on the Confederacy side. No one was injured or died in the shelling.
80 union soldiers
One but that man did not die because of battle but because he was testing a cannon and it exploded.
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Prior to the battle for Fort Sumter in April of 1861, the Confederacy has take over sixteen federal forts. In each case, the Union commanders surrendered and no shots were fired.
There were only two casualties at the Battle of Fort Sumter at the beginning of the American Civil War. Both were Union Soldiers. One was killed during a planned 100-gun salute, and one was killed during evacuation. There were no Confederate casualties.
In the Northern States, the South's attack and capture of Fort Sumter, galvanized support to take arms against the South. Previously many Northerners saw no need for a war with the South. The attack on Fort Sumter changed this and the North wanted to engage in a war to keep the Union intact.
It lasted only a matter of days.