00:00Roman legionaries used rhythmic hobnail boot strikes on hard roads to produce a terrifying acoustic deception.
00:0710,000 heavily armed troops march across hard dirt roads without breaking their rhythmic stride.
00:14Many assume metal armor creates too much random noise to coordinate any stealthy acoustic attack.
00:21Iron hobnails strike the ground together, turning thousands of tiny footfalls into a roaring fake earthquake.
00:29Enemy scouts hear the synchronized strike of thousands of iron hobnails, creating a booming resonance that mimics a tremor.
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