It appears you are referring to the Siege of Savannah, which took place during the American Revolutionary War. The British gained control of Savannah, Georgia, in 1778 after a successful siege. The Continental Army, along with French forces, attempted to retake the city in October 1779 but faced fierce resistance from British troops.
The siege lasted for about three weeks, and despite the efforts of the American and French forces, they were unable to reclaim Savannah. The unsuccessful attempt to retake the city was marked by significant casualties on both sides. Savannah remained under British control until the end of the war in 1783, and its strategic location made it an important stronghold for British forces in the southern campaign.
If you would like more details about the Siege of Savannah or its implications in the context of the Revolutionary War, feel free to ask!