Why are soldiers often told not to march in unison over a bridge
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Why are soldiers not allowed to march on the bridge? - Quora

Space Foundation VP Thomas Dorame: “How To Survive And Thrive During A Time Of Crisis; 5 Lessons I Learned From My Military Experience”, by Chris Quiocho, Authority Magazine

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A Movement, Not a Moment

Can A Contingent Of Marching Soldiers Collapse A Bridge? » Science ABC

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 do soldiers go out of step while crossing a bridge? - Quora

Seven Stories Press

Why are soldiers not allowed to march on the bridge? - Quora

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