First battle of bull run significance. Please list at least 5 bullet points

It was the largest battle in American history until that pointThe Confederacy won the battle, they proved to be a very tough opponent and it served as a wake up call for the northCitizens actually came to watch the battle, even had picnics while watchingIt was the first battle where railroads were utilized for transport of troopsUnion commander Irvin McDowell was blamed for the defeat, and was replaced by Maj. Gen. George B. McClellan