The firing at Fort Sumter was the first battle of the Civil War. It was won by the Confederates, giving them confidence. The firing started because the fort was the Unions and it was on the Confederate's side.
The Battle of Antietam was the bloodiest day in American history. Neither side won the battle, but it gave a slight advantage to the North because of the taken plans Lee lost.
The Emancipation Proclamation was announced after knowing about the plans of the Confederate. This weakened them. The Emancipation Proclamation set free all slaves by 1863 and was issued by Abraham Lincoln.
The siege of Vicksburg was the turning point of the war. The Union gets their victory back with Ulysses S. Grant as their general.
The battle of Gettysburg was won by the Union and pushed the Confederate to Virginia. General Meade and Grant were in charge.
General Lee surrendered at Appomattox Courthouse. The Union won and gave a very generous consequence to the Confederates.