When Brooklyn Heights, on Long Island, had been fortified, General Putnam went with half the army to occupy them. On August 27th General Howe, with something like 20,000 men, attacked a part of these forces and defeated them. If he had continued the battle by marching at once against the remainder, he might have captured all that part of Washington's army under Putnam's command. He might, also, have captured Washington himself, who, during the heat of the battle, had crossed over to Long Island. [Illustration: Map Illustrating the Battle of Long Island.] If Howe had done this, he might have ended the war at one stroke. But his men had fought hard at the end of a long night-march and needed rest. Besides, he thought it would be easy enough to capture the Americans without undue haste. For how could they escape? Soon the British vessels would sail up and get between them and New York, when, of course, escape for Washington and his men would be impossible. This all seemed so clear to the easy-going General Howe that he gave his tired men a rest after the battle on the 27th. On the 28th a heavy rain fell, and on the 29th a dense fog covered the island. But before midday of the 29th some American officers riding down toward the shore, noticed an unusual stir in the British fleet. Boats were going to and fro, as if carrying orders. "Very likely," said these officers to Washington, "the English vessels are to sail up between New York and Long Island, to cut off our retreat." As that was also Washington's opinion, he secured all the boats he could find for the purpose of trying to make an escape during the night. It was a desperate undertaking. There were 10,000 men, and the width of the river at the point of crossing was nearly a mile. It would seem hardly possible that such a movement could, in a single night, be made without discovery by the British troops, who were lying in camp but a short distance away. The night must have been a long and anxious one for Washington, who stayed at his post of duty on the Long Island shore until the last boat of the retreating army had pushed off. The escape was a brilliant achievement and saved the American cause. But this was only the beginning of Washington's troubles in this memorable year, 1776. As the British now occupied Brooklyn Heights, which overlooked New York, the Americans could not hold that place, and in a short time they had to withdraw, fighting stubbornly as they slowly retreated. Washington crossed over to the Jersey side of the Hudson, and left General Charles Lee with half the army at North Castle. The British captured Forts Lee and Washington, with 3,000 men, inflicting a severe loss upon the American cause. The outlook was gloomy, but more trying events were to follow.