Dunno if true, but resonance frequency is the reason German military always avoided making goose step military marches across bridges. I suppose it would depends on the bridge anyway...
But would have been fun to watch.
They did and if I remember correctly they concluded it was busted. I remember this episode in particular because I didn’t feel like their tests were completely sound and didn’t accurately model a civil engineered life-size bridge so at best the result should have been inconclusive.
The machines they built to simulate the marching was entirely inadequate. A much better way to test it would've been a weight on a voice coil, and a contact microphone to monitor echoes. They'd still probably be unable to tear down the bridge model they built, as that thing seemed to be way overbuilt.