Some failures were the invasion of Canada, surrender of Detroit, British burned Washington, D.C.
As emperor, Napoleon made all of the following changes except "<span>Allowing noble émigrés to return to France" although there were definitely a few exceptions. </span>
Germany failed to take over Europe
Italy failed to gain land in Europe
Austria-Hungary failed to keep stable, now they don't exist.
Bulgaria failed to gain the land they wanted
Turkey failed to get back at Russia for the *Crimean Wars
*could be a different war not sure