...essed, at about the middle of the day on the 19th, the appearance on the main street in Menotomy, of a second detachment of British troops, which comprised the reinforcement under the command of Lord Percy that had marched out from Boston, at nine o'clock that morning, through Roxbury, and over the Great Bridge to Cambridge, and thence through Menotomy by the great road to Concord to support the first ...