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“There are phases in history when defensive techniques progress more quickly than offensive techniques. During these periods, wars become rarer because the cost of attacking is higher than the cost of defending. But there are other times when offensive technologies gain the upper hand. These are the bloodiest ages, when wars break out more frequently, because attacking others is cheaper than defending what you have. ... These days, attack is cheaper than defence. Much cheaper. And the price keeps coming down.” — Giuliano da Empoli
There are phases in history when defensive techniques progress more quickly than offensive techniques. During these periods, wars become rarer because the cost of attacking is higher than the cost of defending. But there are other times when offensive technologies gain the upper hand. These are the bloodiest ages, when wars break out more frequently, because attacking others is cheaper than defending what you have. ... These days, attack is cheaper than defence. Much cheaper. And the price keeps coming down.