Duncan Monroe was born December 19th, 1842 in Glengarry County, Ontario. He was the son of John Monroe and
Duncan served with the Mounted Patrol Corps during the Fenian Raids mustering in Cornwall, Ontario on May 25th, 1870. He was discharged in June of the same year.
Duncan passed away in 1936 at the age of 94 in Cornwall, Ontario. He was laid to rest at Woodlawn Cemetary in Cornwall.