The document summarizes the key events leading up to and during the First Battle of Bull Run. It describes how Union General Irvin McDowell led 35,000 troops against 32,500 Confederate troops led by General Joseph Johnston along Bull Run creek in Virginia in July 1861. On the second day of fighting, the Union forces attempted to take the high ground at Henry House Hill but were repelled by Confederate reinforcements, including Stonewall Jackson's brigade. The battle resulted in a surprising Confederate victory that ended Northern expectations of a quick victory.