In the Battle of Eckmühl on 22 April, Davout and Deroy advanced from the west, while Napoleon fell on Rosenberg's position from the south. The Austrians held a key position called the Bettel Berg with 3,000 infantry and 16 cannons. Deroy's cavalry brigade under General-Major Seydewitz attacked first and was driven back by well-handled Austrian light cavalry. Deroy's infantry tried next. Raked by accurate artillery fire and counterattacked by cavalry, they too were defeated. Later in the day, three squadrons of Bavarian cavalry charged again and were mowed down by artillery fire. But as the survivors fell back from the deadly guns, a mass formation of French cuirassiers trotted forward. The heavy cavalrymen swept aside a last despairing Austrian cavalry charge and overran the Bettel Berg. Elements of Deroy's cavalry brigade participated in the famous moonlight cavalry action at Alteglofsheim that night.