On 13 May, Marshal François Joseph Lefebvre and a Bavarian army wrecked part of Chasteler's corps at the Battle of Wörgl near Innsbruck. On 17 May, John received orders to cut the communications of Emperor Napoleon's Grand Army by moving north. However, the archduke delayed too long in carrying out this assignment. Though badly isolated, Jelačić remained near Salzburg until 19 May. When he finally got moving it was too late. A French corps under General of Division Paul Grenier cut the Northern Division to pieces at the Battle of Sankt Michael on 25 May. John pulled back to Graz, but when he heard of Jelačić's disaster, he decided to retreat east into Hungary.