What occurred at Fort Sumter on April 13, 1861

The Battle of Fort Sumter (April 12–13, 1861) was the bombardment of Fort Sumter near Charleston, South Carolina by the South Carolina militia (the Confederate Army did not yet exist), and the return gunfire and subsequent surrender by the United States Army, that started the American Civil War.

Explanation:

What happened at Fort Sumter?

After a 33-hour bombardment by Confederate cannons, Union forces surrender Fort Sumter in South Carolina's Charleston Harbor. The surrender concluded a standoff that began with South Carolina's secession from the Union on December 20, 1860. ...

On April 13, 1861 at Fort Sumter with the surrender of Union soldiers in this fortress started a Civil war in United States.

Explanation:

Fort Sumter was a fortress in Charleston, that was kept by around 80 Union soldiers. Confederate forces, that probably had a couple of thousands of soldiers decided to take the fortress. In the night between 12th and 13th April they bombed the fortress, that eventually led to surrender of soldiers who were defending it. It is interesting that no one died during this event.