Then, joining the main army under Napoleon, in the island of Lobau in the Danube, near Vienna, Eugene and Macdonald acquitted themselves most creditably in the great battle of Wagram (6th July 1809).
After a short and decisive action in Bavaria, Napoleon opened up the road to Vienna for a second time; and after the two days battle at Essling, the stubborn fight at Wagram, the failure of a patriotic insurrection in northern Germany and of the English expedition against Antwerp, the treaty of Vienna (December 14, 1809), with the annexation of the Illyrian provinces, completed, ~, the colossal empire.
And was made general of brigade in November 1806, and for his conduct in the battle of Wagram he was created a baron.
After the battle of Wagram (July 6, 1809) the French armies in the Peninsula received large reinforcements, and by Marshal Massena, with 120,000 men, was ordered to operate against Portugal.
Znaim is best known to history for the armistice concluded here in 1809 after the battle of Wagram between Napoleon I.