Thus by noon the lines of fighting swerved till they ranged along the course of the Littawa stream, save where the allies had thrust forward a long and apparently successful wedge beyond Tellnitz. The Czar saw the danger of this almost isolated wing, and sought to keep touch with it; but the defects of the allied plan were now painfully apparent. Napoleon, having the interior lines, while his foes were scattered over an irregular arc, could reinforce his hard-pressed right. There Davoust was being slowly borne back, when the march of Duroc with part of the Imperial Guard restored the balance on that side. The French centre also was strengthened by the timely arrival of part of Bernadotte's corps. That Marshal detached a division towards the northern slopes of the plateau; for he divined that there his master would need every man to deal the final blows.[43] In truth, Alexander and Kutusoff were struggling hard to regain the Pratzenberg. Four times did the Muscovites fling themselves on the French centre, and not without some passing gleams of success. Here occurred the most famous cavalry fight of the war. The Russian Guards, mounted on superb horses, had cut up two of Vandamme's battalions, when Rapp rode to their rescue with the chasseurs of the French Imperial Guard. These choice bodies of horsemen met with a terrible shock, which threw the Russians into disorder. Rallied by other squadrons, these now overthrew their assailants and seemed about to overpower them, when Bessières with the heavy cavalry of the Guard fell on the flank of the Muscovite horse and drove their lines, horse and foot, into the valley beyond.