The structure consists of a circular, flat-topped mound measuring about 10.6 metres across at its summit and rising between 6 and 8 metres high. What makes it particularly interesting is the substantial berm or terrace that wraps around it at mid-height; this feature spans 7.7 metres wide and stands 3.5 to 4 metres tall.

The origin and purpose of this unusual terrace have sparked debate amongst researchers. Some suggest it might be the result of later landscaping work, particularly given its proximity to Drumcashel House and the presence of what appear to be ramp-like features on the western side. However, there’s another compelling theory: the site might have begun life as a raised rath, an earlier form of Irish fortification, with a Norman motte subsequently built on top of it. The lack of easy access to the summit supports this interpretation, as it would be an odd design choice for a structure built entirely as a motte.

First documented in detail in 1923 and further studied in 1944, the site continues to intrigue historians studying medieval fortifications in Ireland. Whether it represents a single phase of construction or multiple periods of use layered atop one another, Drumcashel Fort stands as a testament to the complex military and social history of medieval Louth, where Irish and Norman traditions often intersected and overlapped in fascinating ways.