The talk explores the story of a place known as "Negro Fort", established at Prospect Bluff in Spanish Florida during the War of 1812. The Fort came about when British Royal Marine and radical anti-slavery advocate Edward Nicolls recruited hundreds of slaves from across the south east of what is now the United States to join the British war effort, making them British subjects. The Fort was left heavily armed when the British were forced to withdraw, and for a while a free community thrived with a strong sense of British identity. It sounds like a fascinating story.
For more, see http://www.gresham.ac.uk/lectures-and-events/north-americas-largest-act-of-slave-resistance