Armeekorps also remained north of the Danube. Archduke Louis spread out his V Armeekorps behind the Abens River, facing west. Having detached Feldmarschall-Leutnant Karl Friedrich von Lindenau's division to Liechtenstein, only the divisions of Feldmarschall-Leutnants Prince Heinrich XV of Reuss-Plauen and Vincenz Freiherr von Schustekh-Herve remained under Louis' command. Feldmarschall-Leutnant Michael von Kienmayer's II Reserve Armeekorps, nominally 7,975-strong, waited in support at Ludmannsdorf. Kienmayer's cuirassier brigade under General-Major Andreas von Schneller was serving with Liechtenstein and four dragoon squadrons were attached to Thierry's brigade. On the evening of the 19th, the bulk of Hiller's VI Armeekorps reached Mainburg to the south. Like V and II Reserve Armeekorps, the VI suffered from detachments. At the beginning of the war, Charles sent the division of Feldmarschall-Leutnant Franz Jellacic to hold Munich, the Bavarian capital, where it remained. Hiller also posted General-Major Armand von Nordmann with a small force at Moosburg an der Isar to watch his south flank. The official returns of Hiller's three corps totalled 75,880 troops, but after detachments, the left wing numbered only 42,000. French deployment When Lannes arrived at the front, Napoleon immediately placed him in command of a provisional corps. This ad hoc formation consisted largely of III Corps units that escaped Archduke Charles' trap the day before, namely General of Division Charles Antoine Morand's 1st Division, General of Division Charles-Étienne Gudin de La Sablonnière's 3rd Division, General of Division Raymond-Gaspard de Bonardi de Saint-Sulpice's 2nd Heavy Cavalry Division, and General of Brigade Charles Claude Jacquinot's light cavalry brigade of Montbrun's division. Also added was General of Division Etienne Marie Antoine Champion de Nansouty's 1st Heavy Cavalry Division from the cavalry reserve. One of Saint-Sulpice's brigades was detailed to guard Saal an der Donau, a defile between Lannes and Davout. On the morning of 20 April, Napoleon mistakenly assumed that the bulk of Archduke Charles' army lay in front of him. Accordingly, he gave orders for a drive southeast in the direction of Landshut. Lannes' mission was to turn the Austrian right flank by pushing south toward Rohr. General of Division Dominique Vandamme would attack Siegenburg with his small Kingdom of Württemberg corps. Lefebvre's other VII Corps divisions, together with General of Division Joseph Laurent Demont's Reserve Division of the III Corps, would link Lannes and Vandamme. Napoleon ordered Masséna's IV Corps to capture Landshut and the Isar River crossings, cutting the Austrian line of communications. Battle