Question

Why are soldiers asked to break steps while crossing a Bridge?

Answer 1

At a certain point, the bridge would start oscillating to the same rhythm as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. Therefore, soldiers are ordered to break their steps while crossing a bridge.

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Answer 2

When soldiers march in three files over a bridge, they generate a rhythmic oscillation of sine waves on the bridge. therefore, soldiers are ordered to break their steps while crossing a bridge.
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