His orders were unrealistic because he underestimated the number of Austrian troops that were heading for Davout; Napoleon believed Charles only had a single corps over the Isar, but in fact, the Austrians had five corps lumbering towards Regensburg, a grand total of 80,000 men.
Tema käsud olid ebarealistlikud, kuna ta alahindas Austria vägede arvu, mis suundusid Davout' poole; Napoleon uskus, et Karlil on vaid üks korpus üle Isari, kuid tegelikult oli austerlastel Regensburgi suunas vantsimas viis korpust, kokku 80 000 meest.