The same weapons that are still the most common today, knives.
But, if you mean which weapons were important to warfare, then spears. Spears were the backbone of every military up until recent times.
Even after the invention of guns, spears were used for ages. The bayonet was an weapon designed to turn a musket into a spear. Even the battles of the American Revolution were fundamentally spear engagements.
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"What if you just eat vegetarians?"-neonreaper
"^ You are what you eat. ^_~"-Koiji