That it was not going to be a short, bloodless war.
Bull Run.
The first Battle of Bull Run was fought July 21, 1861 and was a Confederate victory. The Second Battle of Bull Run was fought August 28-30 1862. It too was a defeat for the North.
First Bull Run
First Bull Run
The battle of Bull Run.
First Manassas(Bull Run) July 21, 1861.
Its significance was that it made the North sides realize the war would not be short and easy.
The Yankees are the North. The Confederates won the Battle of Bull Run.
A unexpected defeat of the Union Army
The Second Bull Run was a Confederate victory.
Most Northerners were surprised at the outcome of the First Battle of Bull Run. The commonplace idea in the North was that a "US Army" would easily defeat a "rebel army". The Northern loss in that battle was shocking to the North. They had no reason to believe the Southerners could win.
they couldn't win