Fort Mercer, on the New Jersey side of the Delaware. 'Twas to Fort Mercer that the defenders of Fort Mifflin escaped on the night of November 15, leaving 40 men behind to burn what was left of Fort Mifflin after the British bombardment. Those 40 also escaped to Fort Mercer later, through the British navy's unwatchful ships. What was the Royal Navy doing? Drinking, sodomizing and flogging as usual.