"...the British did not give up the idea of using Spanish Florida to launch operations against the Americans. The War of 1812 provided the opportunity. Shortly after British soldiers arrived at St. George Island opposite the Apalachicola River in the summer of 1814, they built a fort about 15 miles from the river’s entrance at a place called Prospect Bluff and stockpiled weapons inside."
Our 2007 visit to the area.
The explosion depicted in the display (shown in the picture above) explained here.