In a vicious evening clash the French captured the village, with heavy losses on both sides. The following day brought even more serious fighting. Early in the battle a frontal attack by Napoleon failed, with catastrophic losses. To reverse the situation, the emperor launched a massed cavalry charge against the Russians. This bought enough time for the French right wing to throw its weight into the contest. Soon the Russian left wing was bent back at an acute angle and Bennigsen's army was in danger of collapse. A Prussian corps belatedly arrived and saved the day by pushing back the French right. As darkness fell, a French corps tardily appeared on the French left. That night Bennigsen decided to retreat, leaving Napoleon in possession of a snowy battlefield covered with thousands of dead and wounded. Eylau was the first serious check to the "Grande Armée", and the myth of Napoleon's invincibility was badly shaken. However, the French would go on to win the war by decisively defeating the Russians on 14 June at the Battle of Friedland.