The first two major battles of the Civil war occured at Bull Run. Despite their victory in the first battle, Confederate troops were far too disorganized to press their advantage and pursue the retreating Yankees, who reached Washington by July 22. The First Battle of Bull Run called First Manassas in the South cost some 3,000 Union casualties, compared with 1,750 for the Confederates. (Credit to History.com) Hope this helps!