The Firing at fort Sumter occurred April 12 1861. It happened because the Union Major Robert refused to surrender the fort. The Confederates then attacked the fort for 34 hours. The Union lost the battle and that started the Civil War.
In July of 1861, 35000 union troops marched from Washington D.C to go attack 20000 Confederate troops at Bull Run. A band of rebels came together and attacked the Union troops from the right and made them all flee back to D.C as they were marching. This was a Confederate victory.
The battle of Gettysburg occurred July of 1863. The Confederates went to invade the south because they thought if they could take over the North then they would be recognized as their own nation. This ended when the North attacked the south's army and the south had to surrender. This was a Union victory
The siege of Vicksburg lasted from May to July in 1863. This gave the Union control of the Mississippi River and thus cut off the south's abilities to transport cotton. This made the economy crash which befitted the North greatly.