Archduke John of Austria
Gyulay returned to active service in 1803 and was elevated in rank to Feldmarschall-Leutnant on 14 August 1808. The outbreak of the War of the Fifth Coalition found him in command of a division in the VIII Armeekorps of Johann Gabriel Chasteler de Courcelles. 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.