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