Gwen, There is no Drumgun in Clones or Galoon parish at least I cannot find one. Drumgun is in Donegal. There is Drumguiff which is by Follum and there were certainly Gallaghers in that area and it is within a few miles of Killyfole. There are other townlands beginning with Drum... in the area but as you mentioned Killyfole Drumguiff would be the nearest. There are also lots of Gallaghers in Tyrone in the 1851 census and if you give me names and dates I will have a look for you. Maureen