Siege of Fort Mifflin

Continental forces held Fort Mifflin on Mud Island in the Delaware River for six weeks against devastating British naval bombardment. The garrison's defense blocked the British from resupplying their occupation force in Philadelphia by water, forcing them to rely on overland supply lines that were vulnerable to American raids.

The bombardment of November 10-15 was among the most intense of the entire war. The garrison finally evacuated on the night of November 15 after the fort was reduced to rubble. The defenders' stand bought critical time for the Continental Army and demonstrated a willingness to endure extreme conditions that would define the coming winter at Valley Forge.