During the 1809 campaign in Italy, Viceroy Eugène de Beauharnais led the Franco-Italian army while General der Kavallerie Archduke John of Austria commanded the Austrian army. At the outbreak of war, John moved rapidly to defeat his opponent at the Battle of Sacile on 16 April. This victory drove Eugène back to the Adige River. The front remained static for a few weeks despite attacks by Eugène in the Battle of Caldiero. Meanwhile, an Austrian force bottled up the corps of General of Division Auguste Marmont in Dalmatia. After the Austrian defeat at the Battle of Eckmühl, John received orders to retreat in order to cover the strategic left flank of the army in southern Germany.