It is unassuming enough that the Ordnance Survey never recorded it as an antiquity on their historic maps, noting only a field boundary running parallel to it. The local name for this place is far more direct: Clash na Marbh, the trench of the dead.

When the Archaeological Survey of Ireland inspected the site in 2005, they found a series of low undulations and raised areas along a natural scarp, the kind of eroded terrace that forms above a river bank. The main bank measures about 4 metres wide, stands 0.7 metres high on the river side, and has a gap of roughly 5 metres near its midpoint, with two linear mounds fanning outward toward the water. Behind it, a level strip of ground about 2.2 metres wide appears to represent what local tradition calls the battle trench. That tradition holds that a battle was fought here in 1369, associated with the Battle of Mainister, between Brian Cath an Aonaigh and the Fitzgeralds of Desmond. Local historian Danny Quaine of the Mainister Local History Group confirmed this account, and it is supported, in its grim way, by the physical record: during land improvement works around 1960 or earlier, human remains were found in the field above the earthworks, and when mounds on the higher ground to the north were levelled in an earlier generation, bones were uncovered there too, and quietly reburied. A stretch of the Camoge to the north-east was known as Poill an Cro, the pool of blood, recorded in summer as reaching 8 feet in depth. Nearby, Monasteranenagh Abbey once held fishing rights along this stretch of river and maintained an eel-weir just north-east of the battle site, though dredging works have since destroyed both the weir and much of the riverbank character that once defined the area.

The site sits in private farmland, so access depends on the landowner's permission. The earthworks are subtle and require some patience to read; what looks like ordinary ground variation becomes more legible once you understand the relationship between the bank, the scarp behind it, and the flat strip between them. A ringfort lies about 190 metres to the west-north-west, hinting at a longer history of human activity along this terrace. Satellite imagery from 2020 shows earthmoving at the western end of the monument, so the condition of that portion may have changed. The surrounding pasture is most easily read in late winter or early spring, when low vegetation keeps the ground surface visible.