...campaign. Pursuit was utterly futile until he took refuge in Swift Run Gap, whence he emerged to make some of the most rapid marches on record, as he defeated Milroy at McDowell, flanked Banks at Front Royal , cut his column at Middletown, routed him at Winchester, and pushed him pell-mell across the Potomac. He was about to cross the river in pursuit when, learning that Shields and Fremont (in response...