One other question, however, yet remains, touching this mysterious fort, which we may be allowed to say only "Ossian and the Clyde" can enable us to answer--Why was such a fort ever thought of there at all? It was either to receive provisions and reinforcements from the sea; and if so, then it must have been on the very verge of the frith, and the water must have been sufficiently deep there. Or it was to watch the estuary of the Leven, and to prevent the native Caledonians either landing from the sea, or coming down from the hills to turn the flank of the Wall at Duntocher, and so surprising the Romans in the rear; and this, beyond doubt, was its most important purpose as a military station on the line. But we have elsewhere explained (in the work above alluded to) that there was a regular route for the Caledonians from Dunglass to Campsie, which still bears the name of Fingal; and Fyn-loch, the very first rendezvous on that line, is on the top of the hill immediately above the fort in question. The Romans, who must have been fully aware of this, made their own provision accordingly. In sight of that fort, therefore, Fingal and his people might embark or disembark on their expeditions through Dumbartonshire at pleasure; but it would require to be at a reasonable distance westward, on the sides of Dumbuck or in the quiet creek at Milton, if they wished to escape the catapults and crossbows of the conquerors of the world. Now the earthquake, which extended up the whole basin of the Clyde, seems to have changed all that. The fort was sunk or shattered, as we suppose, and the frith began to fall; and antiquarians who do not believe in Ossian, or who do not keep such obvious facts in view, have been puzzled ever since, and will be puzzled ever more, attempting to account for it.