This particular example was modest in scale, roughly thirty metres in external diameter, and its existence is now known almost entirely from a single cartographic source: the 1834 edition of the Ordnance Survey six-inch map, where it was marked in the distinctive gothic lettering reserved for antiquities and labelled simply as a fort.

By the time anyone thought to record what remained on the ground, it was already too late. A railway cutting, running on a roughly west-northwest to east-southeast alignment, had sliced through the drumlin and with it whatever earthworks had survived into the modern era. When the site was inspected in the 1940s, no archaeological feature could be identified. The fort at Altartate Glebe had, in practical terms, ceased to exist. What makes it quietly notable is precisely this, that it survives only as an ink mark on a Victorian map, a brief gothic label on a hilltop that the railway erased without ceremony. The drumlin remains, the landscape remains, but the enclosure that once gave the spot its character is entirely gone, leaving only the record of its having been there at all.