Concerning depiction of the Russian army in 1805 (historical figures, uniform, people's manners in the military camp and at the battlefield) this film of Gance is somewhat of a cabaret performance. Alexandre I is a kind of a funny mask, Koutouzov - even worse. Russians' uniform and Cossack dances are acceptable for some carnival but certainly not for the historical reconstruction. Above all there is an obvious comic accent in this movie, even in the main episode of the battle. Though the script is not bad being based on the reliable historical source (memoirs of the count Segur) the figure of Napoleon is also ridiculous in some scenes (I wonder why do French actors like to show him as a character of "comedia del Arte"?). To make my claims more motivated I recommend you to compare this "Austerlitz" with the appropriate episode in "War and Peace" by Sergey Bondarchuk - much more dramatic, serious, large-scaled and true in details.