It is not the sort of thing you expect to find forming the boundary of a sports ground. Yet here the north-east corner of what was once a substantial urban enclosure survives largely intact, quietly outlasting the gates, the other wall sections, and most of the town that grew up around it.

The wall's history begins at least as early as 1343, when a royal grant restored the right to collect murage, a toll levied specifically to fund the construction and maintenance of town defences. References to the wall continue through the 14th century and beyond, appearing mostly in property documents. The enclosed area is estimated to have covered around 15 hectares. The River Suir may have served as a natural southern boundary, though there is some suggestion a wall also ran parallel to the riverfront. The northern section followed the line of what are now William Street and Townwall Lane, while the western and eastern arms ran at right angles down towards the river. The eastern arm appears to have met the castle and may have been absorbed into its defences. At least four gates probably punctuated the circuit, at the western and eastern ends of Main Street, on New Street, and at the southern end of Bridge Street. None of these has survived, and several persist only as placenames.

The surviving section is built from randomly coursed sandstone and limestone rubble, with a core of large sandstone blocks. At the corner, a rough limestone staircase, though its three bottom steps have recently collapsed, leads up to a small projecting structure supported on four corbels. A bartizan is a corbelled turret projecting from a wall face, typically used for observation or defence, and this one stands about 2.65 metres above the present ground level. Notably, it lacks openings at its base for dropping missiles on attackers, which raises the question of whether it functioned purely as a look-out post. The most westerly surviving length of wall is leaning outward and was, at the time of survey, in need of attention.