 When the Tyrolean Rebellion erupted in April 1809, Archduke John of Austria sent Chasteler into the Tyrol with about 10,000 troops and appointed Gyulay commander of the VIII Armeekorps.By coincidence, his older brother Ignác Gyulay led the IX Armeekorps, which was the other major maneuver unit in John's army.On 10 April, Albert Gyulay's VIII Armeekorps advanced from Tarvisio (Tarvis) and two days later it occupied Udine.