Near Florida's Prospect Bluff

From Explore Southern History:

The British envisioned using the river as an avenue for invading the United States during 
the War of 1812 and established two forts along the Apalachicola. Their massive post 
at Prospect Bluff was used as a supply and training base.

Jim's Photo Of The Area

Also see British at Prospect Bluff blog post and a Prospect Bluff video here.