The first battle of bull run demonstrated that neither side?

The first battle of run demonstrated that neither side WAS PREPARING FOR A LONG WAR.
The first battle of run was fought on July, 1861 in Virginia. It was the first major battle of the American Civil War. The Union and the Confederate armies clashed and at the end of the day, the confederate were able to send the Union armies running. The result of the first clash shocked many and brought the realization that the war will not be easily won. 

The growth of the empire continued to increase their confidence.