A portion of the regiments of Prescott, Frye, and Bridge, and a fatigue party of two hundred Connecticut troops with intrenching tools, paraded in the Cambridge camp at six o’clock in the evening. They were furnished with packs and blankets, and ordered to take provisions for twenty-four hours. Samuel Gridley’s company of artillery joined them, and the Connecticut troops were placed under the command of Thomas Knowlton, a captain in Putnam’s regiment, who was afterward killed in the battle on Harlem Heights. After an impressive prayer from the lips of President Langdon, of Harvard College, Colonel Prescott and Richard Gridley, preceded by two servants with dark lanterns, commenced their march, at the head of the troops, for Charlestown. It was about nine o’clock at night, the sky clear and starry, and the weather very warm. Strict silence was enjoined, and the object of the expedition was not known to the troops until they arrived at Charlestown Neck, where they were joined by Major Brooks, of Bridge’s regiment, and General Putnam. A guard of ten men was placed in Charlestown, and the main body marched over Bunker Hill. A council was held, to select the best place for the proposed fortification. The order was explicit, to fortify Bunker Hill; but Breed’s Hill being nearer Boston, and appearing to be a more eligible place, it was concluded to proceed to fortify it, and to throw up works, also, on Bunker Hill, to cover a retreat, if necessary, across Charlestown Neck. Colonel Gridley marked out the lines of the proposed fortifications, and, at about midnight, the men, having thrown off their packs and stacked their arms, began their perilous work--perilous, because British sentinels and British ships-of-war were almost within sound of their picks. Officers and men labored together with all their might, with pickaxes and spades, and were cheered on in their work by the distant signals of safety--“All’s well!”--that came from the shipping and the sentinels at the foot of Copp’s Hill. It proclaimed that they were still undiscovered; and at every cry of “All’s well!” they plied their tools with increased vigor. When the day dawned, at about four o’clock, they had thrown up intrenchments six feet high; and a strong redoubt, which was afterward the admiration of the enemy, loomed up on the green height before the wondering eyes of the astonished Britons like a work of magic. The British officers could hardly be convinced that it was the result of a few hours’ labor only, but deemed it the work of days. Gage saw at once how foolish he had been in not taking possession of this strong point, as advised, while it was in his power to do so.