When Napoleon realised that significant Austrian forces were already over the Isar and were marching towards the Danube, he insisted that the entire French army deploy behind the Ilm River in a bataillon carré within 48 hours, all in hopes of undoing Berthier's mistakes and achieving a successful concentration.
Kui Napoleon sai aru, et olulised Austria jõud on juba üle Isari ja marsivad Doonau suunas, nõudis ta, et kogu Prantsuse armee seataks 48 tunniga Ilmi taha üles bataillon carré rivistuses, kõik lootuses parandada Berthier' vead ja saavutada edukas koondumine.