The entrance is in a ruined state on the east side, and between it and the river on the south the masonry has almost wholly disappeared. The walls on the north and west are 6 feet thick, while on the south and east they measure 8 feet, although these sides have otherwise apparently less provision for defence. Mr. Herbert Gillman gives a most interesting suggestion regarding this fact. He says that in all probability a winding stair was situated in the thickness of the walls at the south-east angle, the building of which has now disappeared, and that this stairway terminated at the hall or chief apartment of the castle usually occupied by the castellan. Upon the north-east angle of the tower is now the remains of a ruined turret, and Mr. Gillman thinks this is most likely to have been the protection for the egress to the _allur_ or battlemented walk, which was reached from the main chamber by a second stairway in this part of the wall. By such an arrangement no watchman could leave his post of duty without passing through the room in question, and thus a greater protection would be secured. We learn from the Lismore papers that the top of the fortress was reached by a very narrow “pair of stairs.” The tower is about 55 or 60 feet high. The stone arch which is usual in such buildings covering the internal space, is in this instance situated singularly high up, being immediately beneath the top storey, and there is no mark on the lower walls to show that a second ever existed. The ground floor was used for defence as well as for the usual store, and above it beams, on stone corbels, supported two oak floors between the basement and the arch. Light and air were chiefly admitted by long openings splayed for archery. It is interesting to note also the later apertures introduced after musketry superseded the bow and arrow. Of the former outworks of the fortress little trace remains. On the east of the tower, at about a hundred yards distant, is what an old inhabitant stated to be a disused channel of the River Manghane or Brinny. This fact is borne out, and contradicted, respectively by several maps. The fact that the field lying west of the river is still called “Castle Garden” seems to point out that the channel of the Brinny has been changed. Also the north and west walls of the fortress have the greater number of crenellated openings, which show that they were considered the most vulnerable sides. The Down Survey map of 1656 shows a dwelling-house to the east of the castle. In the mortar on the inside surface of the arch, the marks of the twigs are still visible which formed part of the temporary support used when building. The mortar has much less lime than is usual in such work, no doubt from the distance it would have had to be brought. These markings, as well as the general architecture, indicate that the date 1476, which is usually stated as the time of its erection, is likely to be accurate.