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Why are soldiers often told not to march in unison over a bridge

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Why are soldiers often told not to march in unison over a bridge
We'd rather that bridges never wobbled—but here's why they do
Why are soldiers often told not to march in unison over a bridge
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
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Why are soldiers often told not to march in unison over a bridge
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Why are soldiers often told not to march in unison over a bridge
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Why are soldiers often told not to march in unison over a bridge
What is the risk of injury for soldiers marching in unison with bayonets pointed forward? - Quora
Why are soldiers often told not to march in unison over a bridge
How Marching Soldiers Can Make a Bridge Collapse - Neatorama
Why are soldiers often told not to march in unison over a bridge
Why are soldiers not advisable to march across a bridge in rhythym? - Quora
Why are soldiers often told not to march in unison over a bridge
Battle of Cowpens (U.S. National Park Service)
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