The Fort Sumter battle was important because it was the first battle of the Civil War, and it marked the beginning of the Civil War. The Confederates ending up winning this battle, they didn't have any casualties. This war happened in South Carolina.
The Second Battle of Bull Run, 1862, August 28-30th
Nobody thought the Confederates could do anything but then they won. People of the north was confident that they would win so they had picnics by the battleground. The Union suffered 2,896 casualties, and the Confederates suffered 1,982 casualties.
Battle of Antietam, 1862, September, 17th
It was a series of battles in the Peninsula Campaign consisting of a Confederate counter-offensive which drove the Union Army away from the Confederate capital. The Conferdicy side won this battle. The Union had 15,500 casualties. The Confederacy had 2,000 casualties
Battle of Vicksburg, 1862, June 28th
Because the Confederate side won it gave Robert E. Lee confidence to invade the north. It was the second battle fought in Manassas. The Confederate side had almost 8,000 casualties, and the Union had 14,000 casualties. The Confederate side also won this battle.
It was near Sharpsburg, Maryland. About 23,000 casualties in the one day Battle of Antietam, this made it the bloodiest day in American history. The Union victory at Antietam resulted in President Abraham Lincoln issuing his Preliminary Emancipation Proclamation on September 22, 1862. The Union had 12,400 casualties. The confederate had 10,320 casualties
We split the south in half and took the last part of the Mississippi River. The siege lasted over 40 years, so the Union blocked off all food source entries, so the Confederates had to surrender or else they would die of hunger. It was one of the biggest Union victories of the American Civil War. It also was a major turning point of the Civil War.