The most horrific struggle of the American Revolution occurred just 100 yards off New York, where more men died aboard a rotting prison ship than were lost to combat during the entirety of the war.

Moored off the coast of Brooklyn until the end of the war, the derelict ship, the HMS Jersey, was a living hell for thousands of Americans either captured by the British or accused of disloyalty. Crammed below deck--a shocking one thousand at a time--without light or fresh air, the prisoners were scarcely fed food and water. Disease ran rampant and human waste fouled the air as...

Built in 1927, the German ocean liner SS Cap Arcona was the greatest ship since the RMS Titanic and one of the most celebrated luxury liners in the world. When the Nazis seized control in Germany, she was stripped down for use as a floating barracks and troop transport. Later, during the war, Hitler's minister, Joseph Goebbels, cast her as the "star" in his epic propaganda film about the sinking of the legendary Titanic.

Following the film's enormous failure, the German navy used the Cap Arcona to transport German soldiers and civilians across the Baltic, away...