Судя по нижеприведенному тексту (взят с того же сайта), самого центра вообще нет - он выдвинут настолько далеко вперед, что становится авангардом.
Of particular interest in this campaign is Napoleon's use of the bataillon carre (see below) advancing behind a cavalry screen to execute nearly perfect manoeuvre sur les derries, in order to bring the enemy to battle under circumstances particularly favorable to himself. The French cavalry rode ahead and located the enemy, then reported back to Napoleon the positions of enemy's troops. As soon as the Emperor plotted them on the map, he would order one or both of his wing commanders to engage the nearest enemy force. The reserve was made of heavy cavalry and the Imperial Guard. All troops marched within supporting distance of one another. The wings consisted of one or two army corps each.