Gérard led his troops up the heights but the Allied artillery was well-served and threw back assault after assault. In the afternoon, the Imperial Guard artillery arrived and 40 more guns were brought into action. At 3:00 pm, Napoleon hurled three attack columns at Les Ormeaux and Surville and another one against the Allied right flank along the Seine. While the Guard remained in reserve, the French artillery unleashed a barrage at Surville chateau. The French finally overran Les Ormeaux, causing the Crown Prince to order Schäffer's Austrians to cover the retreat. As the Württembergers began pulling back, Pajol launched a cavalry charge down the Paris highway against the Allied left flank. At this time, French infantry rushed the Surville chateau and made its garrison prisoners. There were now 30,000 French troops on the field supported by 70 or 80 field pieces.