On the 12th the French withdrew all their outposts, and even destroyed the grand battery that commanded the entrance of the harbor, concentrating their whole power upon the defense of the town. Wolfe's active light troops soon gave intelligence of these movements, and the following day the brigadier pushed on his advance round the northern and eastern shores of the bay, till they gained the high lands opposite Goat Island with little opposition; there, as soon as the perversity of the weather would permit, he mounted some heavy artillery, but it was not till the 20th that he was enabled to open fire upon the ships and the land defenses. On the 25th the formidable French guns on Goat Island were silenced. Wolfe then left a detachment in his battery, and hastened round with his main force to a position close to the town, where he erected works, and from them assailed the ramparts and the shipping.
For many days the slow and monotonous operations of the siege continued, under great difficulties to the assailants, the marshy nature of the ground rendering the movement of artillery very tedious. The rain poured down in torrents, swamping the labors of the engineers; the surf still foamed furiously upon the shore, embarrassing the landing of the necessary material and impeding the communication with the fleet. On the night of the 9th of July, the progress of the besiegers was somewhat interrupted by a fierce and sudden sally; five companies of light troops, supported by 600 men, burst upon a small English work during the silence of the night, surprising and overwhelming the defenders. The young Earl of Dundonald, commanding the grenadiers of the 17th, who held the post, paid for this want of vigilance with his life; his lieutenant was wounded and taken, and his men struck down, captured, or dispersed. Major Murray, however, with the Grenadiers of the 22d and 28th, arrived ere long, and restored the fight. After a time the French again betook themselves to the shelter of their walls, having left twenty of their men dead upon the scene of strife, and eighty more wounded or prisoners in the hands of the besiegers.
Meanwhile the British generals pushed on the siege with unwearied zeal, and, at the same time, with prudent caution, secured their own camp by redoubts. Day and night the batteries[113] poured their ruinous shower upon the ramparts, the citadel, and shipping. On the 21st, three large vessels of war took fire in the harbor from a live shell, and the English gunners dealt death to those who sought to extinguish the flames. The next day the citadel was in a blaze; the next, the barracks were burned to the ground, and Wolfe's trenches were pushed up to the very defenses of the town. The French could no longer stand to their guns. On the night of the 25th, two young captains, La Forey and Balfour, with the boats of the fleet, rowed into the harbor under a furious fire, boarded the two remaining vessels of war, and thus destroyed the last serious obstacle to British triumph.[114] The following morning, M. de Drucour surrendered at discretion.