20th Arpil, in the outlet of Abensberg, it is not the main part of the Austrian army that Napoleon is going to meet, but his left wing consisted of 5th corp of the archduke Louis, the 2nd reserve corp of Kienmayer and the 6th of Hiller (placed in Mainburg is partialy engage late in the day) arranged respectively from north to south. Troops under the archduke Louis, displayed on 14 km, between Siegenburg and Bachel, go taken the shock of the French masses. The corp of Lannes, division Morand in the lead is going to collide Thierry et Schustek brigades, which are chased away from the wood and the village of Bachel and are going be cut to pieces by the light cavalry of Jacquinot and the heavies of Saint-Sulpice ; in their attempt of escape towards Rohr village the survivors will be dislodged by an front and flank attack executed by 13th light, 30th and 17th of line. Decimated, in spite of the brave charges of Austrian hussars and dragoons to help them, the foot soldiers of Thierry and Schustek manage to withdraw on Rottenburg, having lost near 5000 men. General Thierry is taken prisoner. In the center, the Bavarians throw back the troops of Bianchi on those of Reuss. After several successive assaults, they get a foothold on the heights of Kirchdorf. The decision is definitively made when the troops of Vandamme attacked on the Austrian right and seize the village of Berka. More in the South, von Wrède push knock down the troops of the archduke Louis. This last one decides to withdraw towards the corp of Hiller. All the Austrian left, the 2nd, 5th and 6th corps, under a hard pressure have to retreat on Landshut at night. Napoleon was at 7.00 am with the Bavarians in the center and stay with them all day long. He was at Rohr at 8.30 pm.