Summary: The 1st Battle of Bull Run, also known as the Battle of Manassas, was the first real battle of the civil war. The army of the Union's General Irvin McDowell was on their way to attack Richmond, the Confederate capital and the army of the Confederacy's General Pierre Gustave Toutant-Beauregard was headed for Washington D.C., the Union and USA capital. On the armies' ways, they crossed near Manassas Junction and Bull Run River, both in Virginia, and the battle began. The Union wanted to get the Confederacy to retreat, but ended up retreating themselves, meaning the Confederates won. This battle had a total of around 4,750 casualties, 3,000 from the Union and 1,750 from the Confederacy. Even if the Confederacy won, both sides lacked experience and would need training if either side wanted to win the war.
Northern Perspective: Northerners would be upset because they are in the Union and wish the Confederacy would not break off from the Union. Unfortunately, it looks so far that the Confederacy may succeed just yet, due to them having the only victory so far.
Southern Perspective: Southerners would be hopeful since they won the first battle, since, well, that's the entire point of a war- to win so you can get what you want out of it. Southerners may still be cautious when noticing that they could've have lost due to their inexperience.