The site consists of a sub-rectangular earthen mound, stretching approximately 26 metres from east to west and 15 metres from north to south. At its western end, archaeologists have identified traces of what appears to be an L-shaped platform, suggesting this was once the foundation for a more substantial structure, possibly a timber castle or fortified residence.

The mound’s position and dimensions hint at its defensive purpose; such raised earthworks were common features of Anglo-Norman settlements in medieval Ireland, typically supporting wooden palisades or stone buildings that have long since vanished. The name ‘Castle Field’ itself serves as a folk memory of the site’s former significance, preserved through generations even as the physical structure deteriorated. Local historian Jordan noted the field’s evocative name as early as 1934, recognising it as evidence of the area’s medieval past.

Today, this unassuming earthwork offers a tangible link to Louth’s medieval landscape, when such fortifications dotted the countryside as symbols of power and control. Though it lacks the dramatic stonework of better-preserved castles, the Barronstown mound represents the more common reality of medieval fortification in Ireland; earth and timber structures that have left only subtle traces in the landscape, their stories preserved in field names and gentle rises in otherwise unremarkable pastures.