At the Battle of Eckmühl on the afternoon of 22 April 1809, the key to the Austrian position was the Bettelberg, a hill topped by a 16-gun battery of artillery and defended by the Austrian IV Corps under Franz Seraph of Orsini-Rosenberg. Some Bavarian cavalry tried to overrun the hill but were driven off. Next, Saint-Sulpice's four cuirassier regiments, two Württemberg cavalry regiments and the rallied Bavarians charged the Bettelberg again. Despite counterattacks by Austrian horsemen and blasts of canister shot from the guns, the Allies seized the hill, capturing most of the cannons. Rosenberg immediately ordered his beaten corps to retreat. At 7:00 pm that evening there was a cavalry melee that involved perhaps 15,000 horsemen. On the Allied side were Nansouty's 24 squadrons of cuirassiers and six squadrons of Württemberg cavalry in the first line. In the second line were Saint-Sulpice's 16 squadrons and in reserve there were 10 to 14 Bavarian squadrons. They were opposed by 32 squadrons of Austrian cavalry. The more numerous Allied cavalry routed the Austrians. As Saint-Sulpice's division led the pursuit, it encountered two battalions of Austrian grenadiers formed in squares and completely smashed them. At 9:00 pm the pursuit ended due to the exhaustion of the Allied cavalry.