Daily National Intelligencer

Boston, September 29.

FROM LAKE CHAMPLAIN.

Lieut. Perry, who arrived in town on Monday evening from Lake Champlain, confirms the account of desertions from Sir George Prevost's army, and informs that they amount to from 600 to 800, all of which were on their way to Whitehall.

He also states that the British fleet was confident of success previous to the late battle, as most of the vessels were almost entirely laden with provisions, ammunition, shot, shells, congreve rockets, guns on carriages, &c. for the land service, &c. all for the army; that the plan of attack, was that after capturing the fleet, the vessels were to attack the fort and batteries at Plattsburgh on the east side, while the army divided into three divisions was to attack, one on the west side, another on the south side, and the third on the north side; but on Sir George's perceiving the British flag struck, he ordered an immediate retreat.

Lieut. P. further states, that the sloop Montgomery of 7 guns, and the President of 10 guns, took no part in the action, as they were employed as transports, at the time at Burlington, the latter about 20 miles from the scene of action with her guns on shore, having received some damage in a gale.