...eneral Beauregard but 4 brigades were directed to the attack of Centreville, of which one and a half had not yet arrived from the Valley, while 6 brigades were to move forward to the Union Mills and Centreville road, there to hold themselves in readiness to support the attack on Centreville, or to move, 2 to Sangster's cross-roads, 2 to Fairfax Station, and 2 to Fairfax Court House. The two and a half bri...