In the expectation that the flower of the British troops would be employed against the heights of Dorchester, General Washington had concerted a plan for availing himself of that occasion, to attack Boston itself. The storm which defeated the proposed attack on the heights defeated this enterprise also. [Sidenote: Boston evacuated.] {March 17.} The determination to evacuate Boston was soon communicated. A paper signed by some of the select men of the town, and brought out with a flag, stated the fact. This paper was accompanied by propositions said to be made on the part of General Howe, but not signed by him, relative to the security of the town, and the peaceable embarkation of his army. As these propositions were not addressed to the Commander-in-chief, and were not authenticated by the signature of General Howe, nor by any act obligatory on him, General Washington thought it improper directly to notice them; and ordered the officer to whom they were delivered to return an answer stating the reasons why they were not treated with more attention. The determination, however, to continue his advances and to secure Nook's Hill, was changed; and considerable detachments were moved towards New York, before the actual evacuation of Boston. This event took place on the 17th of March; and, in a few days, the whole fleet sailed out of Nantasket road, directing its course eastward. The recovery of this important town gave great joy to the United Colonies. Congress passed a vote of thanks to the General and his army, "for their wise and spirited conduct in the siege and acquisition of Boston;" and directed a medal of gold to be struck in commemoration of the event. As soon as the British fleet had put to sea, the American army proceeded by divisions to New York, where it arrived on the 14th of April. During the siege of Boston, an altercation concerning prisoners took place between the commanders of the respective armies, which was viewed with great interest throughout America. The character of the war--a war between a sovereign and those who professed to be his subjects, led to a course of conduct on the part of the British General, which the actual state of things did not justify.