Washington became impatient of this inactive situation; and as soon as the ice in the bay and river became firm enough to allow the passage of troops, he called a council of war, and proposed an attack on Boston. The opinion against the measure was unanimous, and he reluctantly abandoned it. He soon after determined to take possession of Dorchester Heights, which command both harbour and town,—a step which he knew must bring on a general action, during which he intended to cross over to Cambridge with a few chosen men, and force an entrance into the town. During the two or three preceding nights, he bombarded the town heavily from his camp, to divert the attention of the garrison; and on the night of the 4th of March, a large detachment took possession of Dorchester Heights, and immediately commenced throwing up an intrenchment. The night was mild, but the ground was frozen almost impenetrably hard; and it was with excessive labour that a sufficient bulwark was presented by day-light, to cover them from the shot of the enemy. The morning broke,—and a thin haze, which magnified the size of the works, overspread the landscape. The astonishment of General Howe, at discerning this phantom fortification looming up through the mist, upon heights which had been bare and desolate at sunset, was without bounds. The position was so commanding that the town could not be held unless the Americans were dislodged; but this seemed, from the advantages of the ground in favour of the Provincials, next to impossible. The British commander undertook it with great spirit, and two thousand troops were embarked on the same day to cross the harbour to the attack. The transports fell down to the Castle, a small island just below the town; but a tremendous storm suspended their operations. The next day a council of war was held, and it was thought advisable to evacuate the town immediately. The provincials went on completing their fortifications, undisturbed; and in a few days General Howe embarked with all his forces, accompanied by those Americans who adhered to the royal cause. The embarkation commenced at four in the morning of the 17th of March, and at ten in the forenoon General Washington entered the city at the head of his army. The English fleet sailed for Halifax. They were ten thousand strong, including the marines; and left stores to the value of 30,000_l._ with several pieces of cannon, mortars, &c. &c.