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.