Romans threw the pilia, which had soft, hollow heads, first. The soft head embedded the spear into an opponent's shield. The shaft then distorted, pulling the opponent's shield downward as well. Thereby, the enemy was uncovered and made easy prey as the Roman legionnaires closed to use the gladius, the heavy short sword, which was designed as a stabbing rather than a slashing weapon.
The Romans had no compunction about using their allies as archers and slingers to soften up their opponebnts first. Roman's didn't use these weapons themselve primarily because they didn't know how. Why waste time learning how to use them if you have allies available who are better at this than you--sort of like the US Army using Native American scouts during the frontier conflicts of the 1800s.
I think Steve is partly correct about the the unmanly aspect of "indirect fire" weapons/long distance engagements creeping in during the Middle Ages--it was, I believe, a hallmark of the Germannic "barbarians'" style of fighting to engage in one-on-one combat rather than long distance "missile" exchanges. Thes folks became the martial leadership of Western Europe as Rome was supplanted and brought the values of their heritage with them. One proved one's fitness to lead through succeeding in a direct challenge of arms with an incumbent (AKA duel), not by killing the incumbent at a distance with a sling or bowshot. BTW, unlike steel swords, slings and bows were relatively cheap to make, becoming, therefore, the weapons of the hoi polloi, not the elite.
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