Montgomery was pressing the siege of St. John's with great vigour, and had advanced his works near the fort, when the account of the success at Longueisle reached him. On receiving this intelligence, he sent a flag by one of the prisoners, with a letter to Major Preston, the commanding officer, demanding a surrender of the place. All hopes of relief having now vanished, the garrison capitulated, on being allowed the honours of war. Scarcely was this first success obtained, when the consequences of short enlistments began to be felt. The time of service for which the troops had engaged being about to expire, great difficulty was experienced in prevailing on them to proceed farther; and before the General could induce them to march against Montreal, he was under the necessity of stipulating explicitly, that all who wished it should be discharged at that place. Having effected this compromise, he proceeded against Montreal; while his floating batteries, under Colonel Easton, advanced up the St. Lawrence, and not only prevented the armed vessels of the enemy from escaping to Quebec, but drove them still higher up the river. [Sidenote: Montreal surrenders.] {November 13.} Montreal was not in a condition to be defended. After engaging to allow the Canadians in their own laws, the free exercise of their religion, and the privilege of governing themselves, Montgomery took peaceable possession of the town; and Governor Carleton retired to his flotilla. While preparations were making to attack these vessels, the Governor was conveyed in a boat with muffled oars down the river, in a dark night, and made his escape to Quebec. The fleet soon afterwards surrendered, and the General prepared, with the utmost expedition, to proceed with the few troops who were willing to follow him, to the capital of Canada. Diminished as his army was by the discharge of those who claimed the performance of his engagements made at St. John's, it was necessary to leave a part of it at Montreal, St. John's, and Chamblee to garrison those places--keep open the communication between Quebec and the United Colonies--preserve the dependence of the Canadians--overawe the Indians, and hold in check the garrisons above him at Detroit and Niagara. These essential objects, though provided for with the utmost possible economy of men, formed such deductions from his force, as to leave little more than three hundred soldiers to follow their General in the enterprise against Quebec. {August.} Foreseeing that the whole force of Canada would be concentrated about Montreal, General Washington had planned an expedition against Quebec, to be carried on by a detachment from his camp before Boston, which was to march by the way of Kennebec river; and, passing through the dreary wilderness lying between the settled parts of Maine and the St. Lawrence, to enter Canada about ninety miles below Montreal.