...aking me a hasty visit, assumed command of the forces in pursuit of the enemy. This pursuit was kept up * * * until they reached Woodstock. Thus the design of McClellan to post Banks' corps at Centreville (see letter of March 16th) became impracticable, and that body of over 20,000 troops was thought necessary to guard against the further movements of Jackson's 3,000 and the imaginary reinforcements w...