From their feet ran the slim, straight causeway, which was the King’s highway of the district—a trim, prim line of white above the picturesque disorder of the marshes. It skirted the low-lying fields at the foot of the uplands and slipped through an iron gate to end in the far distance at the gigantic portal of The Fort. This was a squat, ungainly pile of rugged gray stone, symmetrically built, but aggressively ugly in its very regularity, since it insulted the graceful curves of Nature everywhere discernible. It stood nakedly amidst the bare, bleak meadows glittering with pools of still water, with not even the leaf of a creeper to soften its menacing walls, although above them appeared the full-foliaged tops of trees planted in the barrack-yard. It looked as though the grim walls belted a secret orchard. What with the frowning battlements, the very few windows diminutive and closely barred, the sullen entrance and the absence of any gracious greenery, Gartley Fort resembled the Castle of Giant Despair. On the hither side, but invisible to the lovers, great cannons scowled on the river they protected, and, when they spoke, received answer from smaller guns across the stream. There less extensive forts were concealed amidst trees and masked by turf embankments, to watch and guard the golden argosies of London commerce.