A fosse is simply a defensive ditch, dug to reinforce the bank thrown up beside it, and together they formed the boundary of what was once an enclosure of the kind built and used across Ireland from the early medieval period onward. That so little survives above ground is itself part of the story; centuries of farming, weathering, and general use have reduced many such sites to little more than a slight rise and a shallow depression.

The enclosure belongs to a class of monument commonly called a ringfort, of which thousands exist across Ireland in varying states of preservation. They served as farmsteads and places of settlement rather than purely military fortifications, and the earthen bank with its ditch would have defined the domestic space within. At thirty metres in diameter, this example sits within the typical range for such sites. Monaghan's drumlin topography, the rounded hills left behind by glacial activity, made for naturally defensible and well-drained positions, and many ringforts in the county occupy exactly this kind of elevated local ground.