At the Battle of Lützen (1813), it succeeded in breaking the Russo-Prussian center, ahead of the main assault by the Imperial guard. In 1815 at Waterloo, the famous opening barrage of the Grande Batterie failed to break the center of Wellington's Anglo-allied army due to his deployment of most of his forces behind the reverse slopes of the rolling hillside and the fact that the ground was still wet and muddy, preventing the usual effects of the bouncing cannonballs.