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In page Infantry:

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The first military forces in history were infantry. In antiquity, infantry were armed with early melee weapons such as a spear, axe, or sword, or an early ranged weapon like a javelin, sling, or bow, with a few infantrymen being expected to use both a melee and a ranged weapon. With the development of gunpowder, infantry began converting to primarily firearms. By the time of Napoleonic warfare, infantry, cavalry and artillery formed a basic triad of ground forces, though infantry usually remained the most numerous. With armoured warfare, armoured fighting vehicles have replaced the horses of cavalry, and airpower has added a new dimension to ground combat, but infantry remains pivotal to all modern combined arms operations.[citation needed]