The conflict began on September 5 when Marshal Joachim Murat's French forces met Konovnitzyn's Russians in a massive cavalry clash, the Russians eventually retreating to the Kolorzkoi Cloister when their flank was threatened. Fighting resumed the next day but Konovnitzyn again retreated when Viceroy Eugène de Beauharnais' Fourth Corps arrived, threatening his flank. The Russians withdrew to the Shevardino Redoubt, where a pitched battle ensued. Murat led Nansouty's First Cavalry Corps and Montbrun's Second Cavalry Corps, supported by Compans's Division of Louis Nicolas Davout's First Infantry Corps against the redoubt. Simultaneously, Prince Józef Poniatowski's Polish infantry attacked the position from the south. Fighting was heavy and very fierce, as the Russians refused to retreat until Kutuzov personally ordered them to do so. The French captured the redoubt, at a cost of 4,000–5,000 French and 6,000 Russian casualties. The small redoubt was destroyed and covered by the dead and dying of both sides.