It would be the aspect of "Joint Stock Companies" that was created by the Commercial Revolution and most clearly paved the way for today’s corporations, since this allows for large amounts of capital to be raised while "spreading out" the risk.
This was the first major land battle of the war. It took place on July 21, 1861 near the city of Manassas, Virginia. General Irvin McDowell led the Union troops against P.T. Beauregard's Confederate Army