The castle of Tsu was one of the strongest in Japan (the outline of its foundations still remains to attest to its vast area), and covered, within the square space of the outer moat, sufficient ground to accommodate an army. This outer moat, upon which many a shallop floated, was wide and deep and sluggish on three sides, masked by a luxuriant crop of lotos; while the fourth wall was washed by a rapidly-running river, the Iwatagawa, which a couple of miles away brawled into the sea. Out of the water rose a platform of great stones, with a fringe of gnarled and rusty pines, through which were visible battlements of earth crowned by a low parapet. At each corner was a huge four-storied building, fitted with four wide roofs of sculptured copper; the walls of whitewashed plaster within frameworks of unpainted wood. Inside this outer defence was a recreation and drill-ground of sufficient extent to allow of room for jousts and spectators, as well as trees and vegetable gardens, and a village of wooden huts for soldiery and camp followers. Dwellings of a better class were clustered like seashells about the second or inner moat, which enclosed a second wall. Within the inner square was a space of considerable size, in the centre of which uprose the castle, a four-sided tower three hundred feet in height, tapering towards the top. By reason of its many roofs or verandahs of burnished and sculptured bronze, it seemed more like a cluster of many towers, the centre one the loftiest; and a picturesque object it was, for owing to the prevalence of earthquakes, all the walls above the foundation platform were of whitened mud and plaster, enclosed like the corner buildings within frames of timber; while the middle roof reared its head with overhanging eaves to a sharp point, crowned on the apex by a great fish, fashioned of pure gold. This fortress was, barring miracle or treachery, justly reputed impregnable. Both moats were crossed by drawbridges, as an extra caution against surprise. The outer entrance was approached round a corner, so that the gate with its side postern was doubly commanded from above. Even if the outer wall were stormed, the inner one frowned on the intruder with manifold engines, while the ground about it could be rendered untenable by missiles from the summit of the tower.