This video is really good to watch if you are studying about American Revolution.
The Americans send out James Armistead, a slave, to spy on the British by pretending to be Benedict Arnold's slave. He finds out that Cato, Moses' brother is a British slave. The British ask James to spy on the Americans the same way he is spying on them.
Click this link for The American Revolution Timeline: http://www.timetoast.com/timelines/the-american-revolution-timeline--24