...o march. About four o'clock P. M., the cavalry rear-guard, on the Yorktown road, was driven in, and rapidly followed by the enemy. Brigadier-General McLaws was sent with the two brigades nearest, Kershaw 's and Semmes's, to support the rear-guard. He met the enemy near and beyond Fort Magruder, made his dispositions with prompt skill and courage, and quickly drove the Federal troops from the field, ...