a new strategy to defeat the Austrians: while the Austrians attacked to the north, André Masséna's corps, augmented by Oudinot's forces, would strike southeast towards Freising and Landshut in hopes of threatening the Austrian flank and relieving the pressure on Davout. Napoleon intended the corps of Davout and Lefebvre to pin the Austrians while his other forces swept into the Austrian rear. The central Austrian V Corps were defeated in the Battle of Abensberg, allowing the French to advance. Napoleon was working under false assumptions that made his goals difficult to achieve. Massena's advance to Landshut required too much time, permitting Hiller to escape south over the Isar. The Danube bridge, which provided easy access to Regensburg, and the east bank had not been demolished. This allowed Austrians to cross the river and stopped France from destroying the forces. On 20 April, the Austrians had suffered 10,000 casualties, lost 30 guns, 600 caissons, and 7,000 other vehicles, but were still a potent fighting force. With the main French army near Landshut, if Charles had attacked Davout he could have destroyed his corps and fallen on the rear of Napoleon's force. He retained the bridge at Regensburg and the road to Straubing and Vienna as an avenue of retreat. 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 Armée d'Allemagnes 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. Napoleon sent Massena to occupy Straubing as he thought the