I've hit the proverbial 'brick wall' with my great great great great grandfather Isaac Montgomery. Rumor has it that he arrived in Maryland circa 1775 (age of 5 or so). The only definite information is his marriage to Ruth Hargrove (or perhaps Hardgrove) on 1 October, 1798 in Harford County, Maryland.
Isaac and Ruth eventually settled in Chippewa Township, Wayne County, Ohio.
All of the children migrated to Sullivan County, Missouri except for George.
I'd appreciate any leads on Isaac's pedigree.