Sledgehammers are primitive weapons, used as tools before the Great War. Although not usually considered as a powerful weapon, a strong person can wield one of these like a club, vastly increasing the damage he causes to his opponent when he hits.
↑Vault Dweller's Survival Guide p.5-16: "While many would consider a Sledgehammer to be an excellent tool, but a poor self-defense weapon, the latest designs are made with lightweight but extremely strong materials. The sledgehammer is a massive weapon, that in the hands of a strong wielder, can knock foes off their feet."
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