I haven't had the time to look into this unit any further, but I was told by a man who seemed very knowledgeable about these things that this unit was mustered into service with volunteers from south central VA and the overlapping parts of north central NC. This corresponds very nicely with the area my ancestors were at the time of the War of 1812. It's also interesting to note that all of my ancestors migrated westward (KY, TN, AR, MO) in the years immediately following the end of the war. By 1820 there were very few left in VA and NC.I suspect they too left for the bounty lands. I'm sure there must be unit records at the Library of Congress and certainly at the West Point library. But going there that requires a considerable investment in time and money. If the FOLD website ever digitizes all of the 1812 records as it has promised to do then searching unit records and bounty land applications may be possible from home. I learned of my ancestor's service in Riddle's unit from the online BLM/GLO records, but these only list the name of the unit and provide no further information.