John Duff (counterfeiter)

John Duff
Born	John Michael McElduff September 1759 – August 1760 South Carolina, British America
Died	June 4, 1799 or 1805 (aged 38-45) Battery Rock, Illinois Country, Northwest Territory, U.S., or Saline River Salt Springs, Illinois Country, Northwest Territory, U.S., or Caseyville, Livingston County, Kentucky, U.S.
Cause of death	gunshot wound
Resting place	unknown
Other names	John McDuff, Jean Duff, Jean Michel Duff, John Michael Duff, Michael Duff
Occupation(s)	frontiersman, hunter, horse thief, cattle thief, hog thief, soldier, salt maker, criminal gang leader, counterfeiter
Spouses	Letticia "Letty" or "Seddy" Smith Native American woman, name unknown
Children	1
Military career
Allegiance	Virginia,  United States
Service/branch	Virginia State Forces
Years of service	1778–1780s
Rank	private, sergeant
Unit	Captain John Williams' Company (Kaskaskia) and Captain Richard McCarty's Company (Cahokia), Illinois Regiment
Battles/wars	American Revolutionary War Illinois Campaign (1778-1779) Capture of Kaskaskia and Cahokia (1778) Siege of Fort Vincennes (1779) Battle of St. Louis (1780)
Signature

John Duff, born John McElduff, or John Michael McElduff, because early court records referred to him as John Michael Duff (September 1759 or August 1760 – June 4, 1799 or 1805), was a counterfeiter, criminal gang leader, horse thief, cattle thief, hog thief, salt maker, longhunter, scout, and soldier who assisted in George Rogers Clark's campaign to capture the Illinois country for the American rebel side during the Revolutionary War.