There was a pedestrian suspension footbridge over the Fall Creek Gorge back in 1943 (built, I think, in 1913). My Dad led his Marine platoon over the bridge in lockstep (violating the rules, natch) and really got the bridge swaying. Of course, those Marines thought that was great fun. Sure glad he lived to tell me all about it.
The same situation came about during my training at Camp Hood Texas in early 1944, A platoon sgt. the day before during a very heavy rain did not break cadence for his platoon when crossing a swollen stream. The bridge tumbled and several soldiers with full back pack got tossed out and drowned. Lesson learned the next day for our platoon. My recall is that it was scary enough.