Sure, but all the things Panzer mentioned (except the sling shot, assuming the author means an ancient catapult) end in a point. While the arrow head is smaller, the comparison between needle v. hammer and arrow v. javelin is not a sound one. It's also pretty clear that if an arrow could pierce a solid inch of bronze with any kind of regularlity ancient armor (which is definatly not an inch of solid bronze) would have been pretty useless, which begs the question, if it was expensive, cumbersome, and offered no real protection, why bother?