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"However this was the first time a bridge had displayed this type of pedestrian excited lateral motion."

The first time? It seems we are doomed to repeat the same mistakes in every generation.

Army officers have ordered troops to stop marching in step when going over bridges for a long time. :)

Mythbusters supposedly disproved this, I wonder if it could actually happen.

There's a sign on the Albert Bridge in London commanding troops to break step: see https://www.londonremembers.com/memorials/albert-bridge-troo... , which refers to an actual bridge collapse: https://en.wikipedia.org/wiki/Broughton_Suspension_Bridge