City / area of battle when british take thousands of prisoners after patriot forces surrender, makeing the worst american defeat of the war

The Siege of Charleston witnessed the greatest military defeat of the colonists during the Revolutionary War (1775-1783). The siege occurred began March 29th and ended on May 12, 1780. This siege was a part of the British southern strategy after being forced to withdraw from Philadelphia. The British took more than 5,500 prisoners and large amounts of ammunition, ships, boats as well as rum, rice, indigo.