Why are soldiers often told not to march in unison over a bridge
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Is it true that soldiers marching, all in step, on a bridge could cause a bridge to collapse? - Quora
Why are soldiers often told not to march in unison over a bridge? - Quora

Science on why soldiers break step when marching on a bridge

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TIL The British army breaks step when crossing bridges. This is because in 1831 a suspension bridge collapsed from all the soldiers marching in unison. : r/todayilearned
Why are soldiers often told not to march in unison over a bridge? - Quora

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TIL The British army breaks step when crossing bridges. This is because in 1831 a suspension bridge collapsed from all the soldiers marching in unison. : r/todayilearned
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