We still call it the Millennium Bridge the 'wobbly bridge', even though it isn't anymore.
I've been looking a bit further - both the bridges at Broughton, Manchester (1831) and at Angers (1850) were suspension bridges. There's an
www.vibrationdata.com/Newsletters/March2002_NL.pdf+broughton+bridge+1831+irwell+rifl e&hl=en]html version of a pdf file[/url] in Google's cache (I couldn't access it directly) which says (after the bit about moonquakes) that soldiers marching in step may have been a factor, but not the only one causing the bridges to collapse.
As the
film of the Tacoma Narrows bridge before it collapsed shows, suspension bridges can move a
lot.