TIL that soldiers are required to "route step" (or walk out of step) when crossing bridges because, in 1831, the rhythmic march of British soldiers broke a bridge, throwing soldiers off of the bridge.

http://www.livescience.com/34608-break-stride-frequency-of-vibration.html



Submitted February 23, 2015 at 11:13PM by SEHumphrey http://www.reddit.com/r/todayilearned/comments/2ww2ks/til_that_soldiers_are_required_to_route_step_or/