_Artillery_.--Previous to the invention of gunpowder in the thirteenth century, the machines of war were divided between two classes of military men, the engineers (_engignours_, as they were called in the middle ages) and the artillery, (_artilliers_, as they were formerly called,) the latter being particularly charged with the management of the lighter and more portable projectile machines, such as the balistas and arco-balistas, which were used for throwing different kinds of arrows--_fleches, viretons, carreaux, matras_, &c., while the former managed the battering-rams, cranes, helipoles, &c. And, indeed, for a long time after the discovery of gunpowder, this distinction was kept up, and the artillery retained all the more ordinary projectile machines, while the engineers constructed and managed the more ponderous weapons of attack and defence. But the new artillery was gradually introduced, without, however, immediately displacing the old, and there were for a time, if we may be allowed the expression, _two_ artilleries, the one employing the old projectile machines, and the other those of the new invention. The latter were called _canoniers_, to distinguish them from the former, who still retained the name of _artilliers_. The first cannon were invented in the early part of the fourteenth century, or, perhaps, among the Arabs as early as the middle of the thirteenth century, but they were not much known in Europe till about 1350. Cannon are said to have been employed by the Moors as early as 1249, and by the French in 1338. The English used artillery at the battle of Crecy in 1346. Both cannon and the ancient projectile machines were employed at the siege of Aiguillon in 1339, at Zara in 1345, at Rennes in 1357, and at Naples in 1380. At this last siege the ancient balista was employed to throw into the castle of Naples barrels of infectious matter and mutilated limbs of prisoners of war. We read of the same thing being done in Spain at a later period.