And what Lost Cause fantasy site did you dredge that up from?
wiki
Google turns up a fair number of uses of the story.
http://www.google.ca/#hl=en&source=hp&q=%22Forrest+offered+freedom+to+44+of+his+slaves+%22&btnG=Google+Search&aq=f&aqi=&aql=&oq=%22Forrest+offered+freedom+to+44+of+his+slaves+%22&gs_rfai=&fp=acec9d3c512d5d32