Abensberg Archduke Charles sent orders to his brother Archduke Louis at 7:30 AM on 20 April. He instructed Louis to fall back to Rottenburg and defend behind the Große Laber. Charles intended Hiller to take position on Louis' left at Pfeffenhausen. Charles erred in sending the orders so late and in not informing Louis of Hohenzollern's withdrawal to the east. The latter move left the V Armeekorps' right flank exposed. Pfanzelter held Bachl on the extreme right flank. To the west of Bachl, Thierry held Offenstetten with three and one-third battalions. His other two and two-thirds battalions had become separated the previous day and joined General-Major Frederick Bianchi, Duke of Casalanza who had six battalions near Biburg. Louis posted Schustekh with four squadrons of hussars and one and one-third battalions at Rohr. Schustekh's infantry had just rejoined V Armeekorps after marching from Mainburg with General-Major Joseph, Baron von Mesko de Felsö-Kubiny's detachment. 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. Historian James R. Arnold offers a different narrative. He writes that Pfanzelter's command was withdrawn on the III Armeekorps commander Hohenzollern's orders, leaving the north–south road through Bachl wide open. Meanwhile, Thierry's attached dragoons discovered that Abensberg and its nearby roads were alive with moving columns of enemy troops. Around 8:00 AM, Thierry fell back on Bachl and found to his dismay that French cavalry already occupied the village. Having become separated from his supporting dragoons, Thierry's men were chased into the woods by Jacquinot's horsemen. From there the Austrians hiked cross-country toward Rohr. Author Francis Loraine Petre states that Gudin encountered Pfanzelter north of Bachl and brushed him aside about 9:00 AM. The 1st Bavarian division and General-Major Hügel's Württemberg brigade drove Thierry from Offenstetten around 10:00 AM. When the Austrians reached Bachl they stumbled upon Jacquinot who attacked and they "scattered through the woods". Pfanzelter marched east to Langquaid where he rejoined Hohenzollern's corps. Because he feared that