Drummully Polyp - Wikipedia
▻https://en.wikipedia.org/wiki/Drummully_Polyp
The area which makes up present day Drummully became part of the newly formed Co. Monaghan around 1585 when the kingdom of Airgíalla came to an end and the land was divided into counties.
Following the Irish War of Independence, in 1922 as part of the Anglo-Irish Treaty, 26 counties including Co. Monaghan seceded from the United Kingdom of Great Britain and Ireland to form Saorstát Éireann (the Irish Free State).
Co. Fermanagh remained in the United Kingdom, meaning that after partition Drummully was inaccessible by road except through the United Kingdom. Drummully was not policed until May 1924 when An Garda Síochána were allowed to pass over the National Frontier through Northern Ireland.
The 1924-25 boundary commission sought to regularise the border but no changes were made to avoid creating further disputes.