On 21 April, Napoleon received a dispatch from Davout that spoke of the Battle of Teugen-Hausen. Davout held his ground; although Napoleon sent reinforcements, about 36,000 French troops had to fight 75,000 Austrians. When Napoleon learned that Charles was not withdrawing to the east, he realigned the "Grande Armée"'s axis in an operation later called the Landshut Maneuver. All of the French forces, except 20,000 troops under Jean-Baptiste Bessières that were chasing Hiller, attacked Eckmühl to trap the Austrians and relieve their beleaguered comrades. On 22 April, Charles left 40,000 troops under Rosenburg and Hohenzollern to attack Davout and Lefebvre while detaching two corps under Kollowrat and Lichtenstein to march for Abbach and gain undisputed control of the river bank. Napoleon arrived at 1:30 pm while the battle continued. Davout ordered an attack along the entire line despite numerical inferiority; the 10th Light Infantry Regiment successfully stormed the village of Leuchling and captured the woods of Unter-Leuchling with heavy casualties. Recognising the threat posed by Napoleon's forces on his left flank, Charles ordered a withdrawal towards Regensburg, granting the field to France.