Mezue ahịrịokwu na-esonụ: Ná mmalite nke Agha nke Ise nke Coalition, Deroy hapụrụ onye isi nke 1st Division na Crown Prince Ludwig nke Bavaria ma were ọrụ nke 3rd Division na VII Corps. Nke a unit mejupụtara 5th, 9th, 10th, na 14th Infantry Regiments, 5th na 7th Light Battalions, ndị "Taxis" Dragoons na "Bubenhoven" Chevau-légers, na 18 iberibe egbe. Mgbe mbuso agha nke Austria gasịrị, Deroy jidere akụkụ ọdịda anyanwụ nke Osimiri Isar n'ihu Landshut na 16 Eprel 1809. N'oge na-adịghị anya, ndị nwụrụnụ na ndị merụrụ ahụ́ n'akụkụ nke ọ bụla dị site na 150 ruo 200. Mgbe ndị agha Austria gafesịrị osimiri ahụ na Moosburg, ọ laghachiri site na Pfeffenhausen ruo Siegenburg. N'okpuru iwu nke Marshal François Joseph Lefebvre, Deroy nọ ebe ahụ mana ọ naghị etinye aka na
Agha nke Abensberg na 20 Eprel.