By going up the valley of this pretty little stream we shall arrive near the Roman station of AEsica, on the Wall.
This station and Aesica are nearer to each other than are any other two stations on the Wall, and a line of camps, five in number, stand south of the Wall and Vallum, from Magna to Amboglanna, showing that a third line of defence was deemed necessary where the natural defences of moorland ridge, lough or crag were absent.
Iron appears to have been introduced into Britain about 300 B.C., and the designs of Late-Celtic Art are here represented best of all. Excellent specimens of Late-Celtic culture have been found in Yorkshire and elsewhere, and important links with continental developments have been discovered at Aylesford, Aesica, Limavady, and other places.
Just here the Wall is in a very ruinous condition; and of the station of AEsica but little masonry remains, though the outlines of it can he clearly traced. Beyond AEsica, however, is a splendid portion of the Wall, standing some seven or eight courses high.