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.