New York Harbor - World War II

World War II

After the United States entered World War II, Operation Drumbeat set the top U-Boat aces loose against the merchant fleet in U.S. territorial waters in January 1942, starting the Second happy time. The U-Boat captains were able to silhouette target ships against the glow of city lights, and attacked with relative impunity, in spite of U.S. Naval concentrations within the Harbor. Casualties included the tankers Coimbria off Sandy Hook and Norness off Long Island. New York Harbor, as the major convoy embarkation point for the U.S., was effectively a staging area in the Second Battle of the Atlantic, with the U.S. Merchant Marine losses of 1 of 26 exceeding those of the other U.S. forces.

Bright city lights made it easier for German U-boats to spot targets at night, but local officials resisted suggestions that they follow London's lead and blackout the lights of coastal cities. However, some lights were darkened, including those of the amusement parks in Coney Island, Brooklyn, and the Coney Island Light, and Sandy Hook Lighthouse.

The Harbor reached its peak activity in March 1943, during World War II, with 543 ships at anchor, awaiting assignment to convoy or berthing (with as many as 426 seagoing vessel already at one of the 750 piers or docks). 1100 warehouses with nearly 1.5 square miles (3.9 km2) of enclosed space served freight along with 575 tugboats and 39 active shipyards (perhaps most importantly New York Naval Shipyard founded 1801). With a staggering inventory of heavy equipment, this made New York Harbor the busiest in the world.