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TIL that in April 1831, in northern England, the combined and synchronised footsteps of a British Army unit induced mechanical resonance in a suspension bridge, which caused its collapse and many injuries. British Army practice is now that all troops must break step as they cross bridges.
https://en.wikipedia.org/wiki/Broughton_Suspension_Bridge
Broughton Suspension Bridge - Wikipedia
       
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Per the link, there were issues with some of the bridge's bolts and this would've happened eventually anyway.

27

Someone watched a recent veritasium episode ;)

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