Okay kiddo, let me explain the Second Battle of Fort Wagner to you in a way that you can easily understand.
A really long time ago, during a war called the American Civil War, there was a battle at a place called Fort Wagner. The first time there was a battle there, a group of soldiers called the Union tried to take over the fort but they didn't win.
Later, they had a second try. The Union soldiers had more people this time and they attacked the fort again. They used big cannons and guns and they even set off bombs.
The soldiers fighting for the South were called the Confederate soldiers. They were trying to protect the fort and keep it under their control.
During the battle, many soldiers on both sides were hurt or killed. The Union army kept trying to break into the fort, but the Confederate army was strong and wouldn't let them in.
Eventually, after hours of fighting, the Union soldiers gave up and left. They didn't take over the fort this time either.
The Second Battle of Fort Wagner was an important fight because it showed how difficult it was to win a battle during the Civil War. It also proved that both the Union and Confederate armies were very brave and dedicated to their cause.