Why was it that every city--nay, every little town--had to be not only walled about but to have its outposts? Because France was not a nation, only a congeries of individualities. As Michelet says of the fourteenth century: "The kingdom was powerless, dying, losing self-consciousness, prostrate as a corpse. Gangrene had set in, maggots swarmed, I mean the brigands, English and Navarese. All this rottenness isolated, detached the members of the poor body from one another. One talks of the Kingdom, but there were no States General, nothing at all general, no intercommunication, the roads were in the power of cut-throats. The fields were all battlefields, war was everywhere, and none could distinguish friend from foe." How needful these outposts were may be judged from what Froissart says: "Rogues took advantage of such times (of truce), and robbed both towns and castles; so that some of them, becoming rich, constituted themselves captains of bands of thieves; there were among them those worth forty thousand crowns. Their method was to mark out particular towns or castles, a day or two's journey from each other; then they collected twenty or thirty robbers, and travelling through by-roads in the night-time, about daybreak entered the town or castle they had fixed upon, and set one of the houses on fire. When the inhabitants perceived it they thought it had been a body of soldiers sent to destroy them, and took to their heels as fast as they could" (Bk. i., c. 147). Passing on from the outposts to towns, or defences to highways, we must glance at such as guard the approaches to countries, or such as Gibraltar that commands the great waterway between the Mediterranean and the Atlantic. Gibraltar is certainly the most complete and marvellous of all cliff castles. This is too well known to English travellers to need description here. The French Gibraltar, Urdos, commands one of the passes through the Pyrenees. It is hewn out of the mountain in a buttress of rock, and rises in stages from the road to the height of 500 feet. Externally the mountain looks harmless enough. A cave opens here, and a rift there, and a few streaks of masonry may be noticed, but actually the mountain is riddled with galleries, batteries, and long flights of stairs, and hollowed out for ammunition and other stores; and it is capable of containing a garrison of three thousand men.