...rcements, had also received Barlow's brigade from the right flank of the 11th corps, Williams's division of the 12th corps, and three regiments of cavalry and some horse artillery under Pleasonton. Posey 's brigade held the left flank of Lee's line of battle in Hooker's front, while Jackson conducted the flanking movement. Posey had a strong force of skirmishers in front, which became hotly engaged ...