Using authentic battle gear and uniforms of the period, re-enactments of famous battles and ceremonies are regularly staged. The most famous of these is the Battle of Austerlitz, which took place on 2 December 1805 and has been celebrated since. 2 December, nicknamed "2S" by the Saint-Cyr cadets, is the date of many Saint-Cyr related celebrations in the Army proper or among the alumni associations made up of graduates of the school.