Battle of Friedland
During the Napoleonic Wars, both mitres and fur caps fell out of use in favour of the shako. Two notable exceptions were the grenadier companies and Imperial Guard regiments of the French Grande Armée, plus those of the Austrian Army. After the Battle of Friedland in 1807, because of their distinguished performance, Russia's Pavlovsk Regiment were allowed to keep their mitre caps and were admitted to the Imperial Guard.