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 they had taken the possibility of assault into account; they had isolated the bridge from the tower by means of a low, heavy iron door; this door was arched; it was locked with a large key, kept in a hiding-place known to the keeper alone, and once closed, this door could defy the battering-ram, and almost withstand cannon balls.

It was necessary to pass through the bridge to reach this door, and to pass through this door to enter the tower. There was no other entrance.

second story of the chatelet on the bridge, raised on the piers, corresponded to the second story of the tower; the iron door had been placed at this height to make it more secure.

The iron door opened from the side of the bridge into the library, and from the side of the tower into a great arched hall with a pillar in the centre. This hall, as has already been said, was in the second story of the keep. It was round, like the tower; long loopholes, looking out on the plains, lighted it. The wall was quite rough and bare, and nothing concealed the stones, which were very symmetrically laid. This hall was reached by a winding staircase made inside the wall, a thing easily done when the walls are fifteen feet thick. In the Middle Ages, a town was taken street by street; a street, house by house; a house, room by room. They besieged a fortress, story by story.

La Tourgue was in this respect very ingeniously arranged, very churlish, and very unapproachable. A spiral staircase, extremely steep and inaccessible, led from one story to another; the doors were slanting and not so high as a man, and it was necessary to bow one's head in order to pass through; but a bowed head meant a head knocked off, and at each door the besieged awaited the besiegers.

Below the round hall with the column were two similar rooms, which formed the first story and the ground floor, and above there were three; above these six rooms placed one upon another, the tower was closed over with a roof of stone, which was the platform, and reached by a narrow watch-tower.