Colonel Plug (1700s? – 1820?), also known as Colonel Fluger and "The Last of the Boat-Wreckers", who existed sometime between the 1790s and 1820, was the legendary river pirate who ran a criminal gang on the Ohio River in a cypress swamp near the mouth of the Cache River. The outlaw camp of Colonel Plug was supposedly below the river pirate hideout of Cave-In-Rock and the U.S. Army post at Fort Massac, which monitored and policed frontier river traffic just above the confluence of the Ohio and Mississippi Rivers.