July 7 - We breakfasted with General Putnam, who we found to be rough in his manner and speaking, but cheerful. He offered us his barge and D Morgan accompanied us to Governor’s Island, Red Hook and a Neck that joined Long Island. The works at theses places were good, but the general complaint was want of cannon.
Diary of Dr. James Clitherall, 1776.
The "works" in Red Hook that Dr. Clitheral is referring to were raised earthen walls which were part of the defense of Fort Defiance. Fort Defiance, a battery of cannons aimed at the harbor, is said to be important to the American Revolution. Its cannon fire harassed the British fleet playing a roll in the slow advance of British forces allowing George Washington and the American forces to withdraw from Brooklyn during the Battle of Long Island.
George S. Sproule's 1781 map of the American defences during the Revolutionary War provides a depiction of Fort Defiance. In 1776 Fort Defiance was practically on an island separated by ponds and streams from the rest of Red Hook. The high points on which the Fort was situated are the same high points that did not flood during Hurricane Sandy.
[Note: The History of Fort Defiance and its exact location is a far more involved story than is reflected by this short entry]