After the attack at Fort Sumter, what was the next major battle of the civil war?

The first Battle of Bull Run was the second battle of the civil war and the battle after the attack on Fort Sumter.

Explanation:

After the victory of the attack on Fort Sumter, the General Winfield Scott wanted to wait a while before the next battle, but his own troops were anxious to attack immediately due to the rebel attacks in South Carolina.

They forced the general to think that they were ready to attack. Remarkably, they actually defeated the rebels. Winfield Scott wrote earnestly how his troops annihilated the rebels that attacked Fort Sumter.

First Battle of Bull Run was the next major battle of the civil war.