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The efficacy of cannon in breaching solid masonry was taught Europe by the Turks, a few years after wards, at the memorable siege of Constantinople. In our French wars, as in the wars of the classic nations, famine was looked on as the surest weapon to compel the submission of a well-walled town and the great object of the besiegers was to effect a complete circumvallation.

The existing provisions were still, when the Roman circumvallation was closed, sufficient for a month and perhaps something more; at the last moment, when there was still free passage at least for horsemen, Vercingetorix dismissed his whole cavalry, and sent at the same time to the heads of the nation instructions to call out all their forces and lead them to the relief of Alesia.

So unskilled were the Greeks in the attack of fortified cities, that the besiegers made no progress, and were obliged to resort to blockade. A wall of circumvallation was built around the city, which was now left to the operations of famine. The Spartans and their allies suffered a repulse at Stratus, and their fleet was defeated by Phormio, the Athenian admiral.

The circumvallation, which is far from being perfectly regular, is about 62 miles in diameter, and, considering its size, is not remarkable for its altitude, as it nowhere exceeds 6000 feet above the interior, which is depressed about 2000 feet below the surrounding plain. Its continuity, especially on the E., is interrupted by gaps. On the N., the wall is notably deformed.

"The war," he says, "has introduced abundance of polysyllables, which will never be able to live many more campaigns." Speculations, operations, preliminaries, ambassadors, pallisadoes, communication, circumvallation, battalions, are the instances he gives, and all are now familiar. No man, or body of men, can dam the stream of language.

Antigonus began to fear for his safety; he ordered them to keep at a distance, and at last throwing his arms round the waist of Eumenes conducted him back through a passage formed by his guards to the foot of the fortress. XI. After this Antigonus invested the place with a double wall of circumvallation, left a force sufficient to guard it, and marched away. Eumenes was now closely besieged.

The Syracusans and their allies had run out an outwork along Epipolae from the city walls, intersecting the fortified lines of circumvallation which Nicias had commenced, but from which they had been driven by Gylippus.

"I humbly crave your pardon, Signor," said the Free Companion; "but really so attractive is the life led by Free Lances, under Fra Moreale, that sometimes we forget the ; but pardon me we will on." A few moments more, and bounding over a narrow circumvallation, the party found themselves in a quarter, animated indeed, but of a wholly different character of animation.

Thus the Moors were enclosed on all sides by trenches, palisadoes, walls, and castles, so that it was impossible for them to sally beyond this great line of circumvallation, nor could any force enter to their succor.

The Seven Mounts Suburbs grew up one after another, each protected by its own separate though weaker circumvallation and joined to the original ring-wall of the Palatine, as in fen districts the outer dikes are joined on to the main dike.