Ludwig of Bavaria
In one account, Lannes' advance guard approached Bachl in the late morning of 20 April, forcing Pfanzelter's small detachment from the Austrian III Armeekorps eastward. The 1st Bavarian Division under Lieutenant General Crown Prince Ludwig of Bavaria and the 3rd Bavarian Division led by Lieutenant General Bernhard Erasmus von Deroy, together with Demont's III Corps Division advanced on Offenstetten. Around 10:00 AM, they defeated Thierry's brigade, forcing him back on Bachl as Lannes approached from the north. Thierry hastily withdrew to Rohr, which he reached at 2:00 PM.