The grenadiers and light infantry, under the immediate command of Colonel Smith, remained in the centre of the town. Captain Parsons, with six light companies, about two hundred men, was detached to secure the North bridge and to destroy stores, who stationed three companies, under Captain Laurie, at the bridge, and proceeded with the other three companies to the residence of Colonel Barrett, about two miles distant, to destroy the magazines deposited there. Captain Pole, with a party, was sent, for a similar purpose, to the South bridge. The British met with but partial success in the work of destruction, in consequence of the diligent concealment of the stores. In the centre of the town they broke open about sixty barrels of flour, nearly half of which was subsequently saved; knocked off the trunnions of three iron twenty-four-pound cannon, and burned sixteen new carriage-wheels and a few barrels of wooden trenchers and spoons. They cut down the liberty-pole, and set the court-house on fire, which was put out, however, by the exertions of Mrs. Moulton. The parties at the South bridge and at Colonel Barrett's met with poor success. While engaged in this manner the report of guns at the North bridge put a stop to their proceedings. The British troops had been in Concord about two hours. During this time the minute-men from the neighboring towns had been constantly arriving on the high grounds, a short distance from the North bridge, until they numbered about four hundred fifty. They were formed in line by Joseph Hosmer, who acted as adjutant. It is difficult, if not impossible, to ascertain certainly what companies were present thus early in the day. They came from Carlisle, from Chelmsford, from Westford, from Littleton, and from Acton. The minute-men of Acton were commanded by Captain Isaac Davis, a brave and energetic man. Most of the operations of the British troops were visible from this place of rendezvous, and several fires were seen in the middle of the town. Anxious apprehensions were then felt for its fate. A consultation of officers and of prominent citizens was held. It was probably during this conference that Captain William Smith, of Lincoln, volunteered, with his company, to dislodge the British guard at the North bridge. Captain Isaac Davis, as he returned from it to his ranks, also remarked, "I haven't a man that's afraid to go." The result of this council was that it was expedient to dislodge the guard at the North bridge. Colonel Barrett accordingly ordered the militia to march to it, and to pass it, but not to fire on the King's troops unless they were fired upon. He designated Major John Buttrick to lead the companies to effect this object. Lieutenant-Colonel Robinson volunteered to accompany him. On the march Major Buttrick requested Colonel Robinson to act as his superior, but he generously declined.