Abraham worked as a servant for a physician, Doctor
Sierra. During the War of 1812, this educated, articulate man joined the Corps of Colonial Marines under Major Edward Nichols
, who promised freedom to any slave who joined him.
Abraham helped build the fort at
Prospect Bluff in Florida.
When Nichols and Upper Creek Chief Josiah Francis set sail for England in
1815, Abraham stayed behind in the Fort, which had become a haven for Africans
who had escaped from slavery.
The fort came to be known as the Negro Fort and was
attacked and destroyed during July of 1816 upon the orders of Andrew Jackson, though the fort was located in Spanish territory. Abraham was one of the few
survivors. He made his way to the Seminole village known SuwanneeRiverTown
in Florida, where he served as "sense bearer" (a sort of prime minister) for Chief Bowlegs.
He lived in an African town in Florida
called Pilaklinkaha, or Many Ponds, and was adopted as a member of the Seminole