... event of an advance by the enemy, for which he had learned active preparations were being made. He anticipated that the enemy's main force would move on the road through Fairfax Court-House and Centreville toward Manassas, and his plan was, for all the troops on the north of Bull Run to fall back to the south bank of that stream. Bonham, in the centre on the direct road to Manassas, to Mitchell's Fo...