Final answer:
During the Revolutionary War, the American army used deception and strategy to escape when the enemy tried to encircle Harlem.
Step-by-step explanation:
During the Revolutionary War, when the enemy tried to encircle Harlem, the American army, under the leadership of George Washington, devised a plan to deceive the British forces. They had the new troops pretend to be the entire army, while Washington's main force quietly retreated from Manhattan Island under cover of darkness and rain. By morning, when the British realized Washington was gone, he and his entire army of 9,000 soldiers had successfully escaped to Manhattan.