What was the result of the British attack on New York City?

The British held the Port of New York for the rest of the war.

Explanation:

During the American Revolution, British forces led by General William Howe attacked New York at the Battle of the Brooklyn Heights, or the Battle of Long Island. 10,000 American troops fought against Howe's 20,000, including Hessians. Howe's force surrounded the American forces, and they fled across the East River.