The label referred to a encampment of Williamite forces, the army fighting in the name of William of Orange during the upheaval of the late seventeenth century that reshaped power across Ireland. By the time the Ordnance Survey revised its maps in 1910, the marking had vanished entirely, and when the site was physically examined in 1981, investigators found no trace of fortifications on the ground. What survives, then, is cartographic rather than material: a circle drawn on paper, a name, and a location on a ridge.

The 1837 Ordnance Survey six-inch map and the associated Fair plan both recorded the enclosure, and it is from these sources that almost everything known about the site descends. The broader landscape around Ballymore was clearly contested ground during this period. Less than 750 metres to the northeast lies a seventeenth-century bastioned fort associated with the Jacobite army, the opposing force loyal to the Catholic King James II. A bastioned fort is a form of artillery fortification designed with projecting angular structures that eliminated blind spots along the walls. That the two camps sat within sight of each other, on either side of this small Westmeath village, gives some sense of how localised and entrenched the conflict could become. The medieval church and graveyard lie roughly 520 metres to the east, and the remains of a castle and Plary Monastery are a similar distance to the southeast, so the armies were moving through a landscape already layered with older structures and boundaries.