...e afternoon of July 2d, a few moments before Longstreet opened his assault, Meade telegraphed to Halleck: If satisfied the enemy is endeavoring to move to my rear, I shall fall back to my supplies at Westminster . He had already sent Buford there, two hours before. General Meade's chief-of-cavalry, Major-General Alfred Pleasonton, states that in the afternoon of the 2d of July General Meade gave me the o...