Awnser : It proved that a quick victory for the north was impossible
Explanation : The First Battle of Bull Run, also known as the Battle of Manassas, marked the first major land battle of the American Civil War. ... The Confederate victory gave the South a surge of confidence and shocked many in the North, who realized the war would not be won as easily as they had hoped.
I would have to say its D. because that's the option that makes sense
