... with the bayonet, capturing prisoners and colors, and driving the routed columns in confusion from the field. About seven o'clock, as fresh troops were accumulating in front of Porter and Couch, Meagher and Sickles were sent with their brigades, as soon as it was considered prudent to withdraw any portion of Sumner's and Heintzelman's troops, to reinforce that part of the line and hold the position....