 During Napoleon's Hundred Days, he immediately supported Napoleon, and in the Waterloo campaign he commanded the IV Cavalry Corps.At the Battle of Ligny on 16 June 1815 with his cuirassier divisions he broke the centre of the Prussian army and helped to win Napoleon's last victory.Two days later at the Battle of Waterloo 18 June his divisions took part in the great general cavalry assault on the allied centre, a plan he had opposed but had to execute.