The Battle of Abensberg was fought on 20 April 1809, between an Allied force under the command of Emperor Napoleon I of France on one side and three Austrian corps led by Johann von Hiller, Archduke Louis of Austria, and Michael von Kienmayer. The Austrians formed the left wing of Archduke Charles, Duke of Teschen's main army and were under the overall command of Hiller. Napoleon's French troops, reinforced by troops from the Kingdom of Bavaria and the Kingdom of Württemberg outfought their opponents, inflicted heavy losses, and forced the Austrians to retreat to the southeast.
During the fighting, 55,000 French and Germans faced 42,000 Austrians. Of these, only about 25,000 on each side became involved in the fighting. The Austrians lost 2,710 killed and wounded, plus about 4,000 captured. Allied losses were 215 Frenchmen, 146 Württembergers, and 746 Bavarians, for a total of 1,107.
Austrian forces
Left Wing: Feldmarschall-Leutnant Johann von Hiller
VI Armeekorps
Feldmarschall-Leutnant Johann von Hiller (35,639) Reserve Artillery: Feldmarschall-Leutnant Karl von Rouvroy Three 12-pdr position batteries (18 guns), 6-pdr position battery (6 guns) Division: Feldmarschall-Leutnant Friedrich Kottulinsky Brigade: General-Major Otto Hohenfeld Klebek Infantry Regiment # 14 (3 battalions) Jordis Infantry Regiment # 59 (3 battalions) 6-pdr brigade battery (8 guns) Brigade: General-Major Nikolaus Weissenwolf Deutschmeister Infantry Regiment # 4 (3 battalions) Kerpen Infantry Regiment # 49 (3 battalions) 6-pdr brigade battery (8 guns) Artillery: 6-pdr position battery (6 guns) Division: Feldmarschall-Leutnant Franz Jellacic (Jellacic detached at Munich) Brigade: General-Major Josef Hoffmeister (Brigade attached to Vincent) Benjowsky Infantry Regiment # 31 (3 battalions) Splenyi Infantry Regiment # 51 (3 battalions) 6-pdr brigade battery (8 guns) Brigade: General-Major Konstantin Ettingshausen (Brigade detached at Munich) Esterhazy Infantry Regiment # 32 (3 battalions) De Vaux Infantry Regiment # 45 (3 battalions) 6-pdr brigade battery (8 guns) Artillery: 6-pdr position battery (6 guns) Light Division: Feldmarschall-Leutnant Karl von Vincent Brigade: General-Major Karl Dollmayer von Provenchères (Brigade detached at Munich) Warasdin-Kreutzer Grenz Infantry Regiment # 5 (2 battalions) 4th, 5th, 6th Vienna Freiwilligers battalions O'Reilly Chevauxleger Regiment # 3 (8 squadrons) 3-pdr Grenz brigade battery (8 guns) 6-pdr cavalry battery (6 guns) Brigade: General-Major Armand von Nordmann (Brigade detached at Moosburg) Warasdin-St. George Grenz Infantry Regiment # 6 (2 battalions) Rosenberg Chevauxleger Regiment # 6 (8 squadrons) Liechtenstein Hussar Regiment # 7 (8 squadrons) 3-pdr Grenz brigade battery (8 guns) 6-pdr cavalry battery (6 guns)
V Armeekorps
Feldmarschall-Leutnant Archduke Louis (32,266) Reserve Artillery: Major Adam Pfefferkorn Two 12-pdr position batteries (12 guns), one 6-pdr cavalry battery (6 guns) Brigade: General-Major Ludwig Thierry (Brigade attached from III Armeekorps) Kaiser Infantry Regiment # 1 (3 battalions) Lindenau Infantry Regiment # 29 (3 battalions) 6-pdr brigade battery (8 guns) Division: Feldmarschall-Leutnant Karl Friedrich von Lindenau (Division detached to I Reserve Armeekorps) Brigade: General-Major Josef Mayer Archduke Charles Infantry Regiment # 3 (3 battalions) Stain Infantry Regiment # 50 (3 battalions) 6-pdr brigade battery (8 guns) Brigade: General-Major Ignaz Buol von Berenburg Hiller Infantry Regiment # 2 (3 battalions) Sztarrai Infantry Regiment # 33 (3 battalions) Artillery: 6-pdr position battery (6 guns) Division: Feldmarschall-Leutnant Prince Heinrich XV of Reuss-Plauen Brigade: General-Major Frederick Bianchi, Duke of Casalanza Duka Infantry Regiment # 39 (3 battalions) Gyulai Infantry Regiment # 60 (3 battalions) 6-pdr brigade battery (8 guns) Brigade: General-Major Franz Johann Schulz von Rothacker Beaulieu Infantry Regiment # 58 (3 battalions) 1st, 2nd, 3rd Vienna Freiwilligers battalions Artillery: 6-pdr position battery (6 guns) Light Division: Feldmarschall-Leutnant Emmanuel von Schustekh-Herve Brigade: General-Major Joseph, Baron von Mesko de Felsö-Kubiny Broder Grenz Infantry Regiment # 7 (2 battalions) Kienmayer Hussar Regiment # 8 (8 squadrons) 3-pdr Grenz brigade battery (8 guns) Brigade: General-Major Joseph Radetzky von Radetz Gradiscaner Grenz Infantry Regiment # 8 (2 battalions) Archduke Charles Uhlan Regiment # 3 (8 squadrons) Artillery: 6-pdr cavalry battery (6 guns)