The Battle of Hollabrunn was a rearguard action fought on 9 July 1809 by Austrian VI Korps of the Kaiserlich-königliche Hauptarmee under Johann von Klenau against elements of the French IV Corps of the Armée d'Allemagne, under the command of André Masséna.

[3] The battle ended in favour of the Austrians, with Masséna forced to break off the combat and wait for his remaining divisions to reinforce him, but the French Marshal was able to gather crucial intelligence about the intentions of his enemy.

[4] The French victory at the Battle of Wagram on 6 July forced the commander of the Kaiserlich-königliche Hauptarmee, the main Austrian army, Archduke Charles of Austria-Teschen, to retreat.

These combats, fought at Korneuburg and Stockerau allowed Masséna to inform Napoleon that a large Austrian force was indeed retreating towards Bohemia.

Masséna promptly engaged Klenau, while at the same time conducting a full reconnaissance of the battlefield, which enabled him to write to the Emperor and reconfirm that no Austrian regiments were heading towards Krems.