How about you read the book and find out!
They were promised their freedom
I say Freedom :)
The British offered them freedom if they served with them. An interesting historical fact is that many slaves found freedom on ships.
Freedom
They thought they were fighting for there freedom
They thought they were fighting for there freedom
by promising them freedom
The British offered freedom and independence. The 13 colonies offered more rights. The slaves went for British because they wanted freedom, not rights.
They thought they were fighting for there freedom
They offered them freedom, but in the final result very few were freed.
They thought they were fighting for there freedom
Promised freedom to slaves that joined the British cause