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The warships with roofs covered in iron spikes

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Hand-to-hand combat at sea is messy, so ancient naval engineers decided to just make stepping onto their boats a lethal endeavor. Korean 'Turtle Ships' were heavily fortified vessels capped with an entirely enclosed wooden roof covered in iron spikes. Enemy forces attempting to jump aboard would immediately impale themselves, leaving the crew inside perfectly safe to continue firing cannons.

The warships with roofs covered in iron spikes
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