The French lost over 20,000 men including one of Napoleon's ablest field commanders and close friend, Marshal Jean Lannes, who died after being mortally wounded by an Austrian cannonball in an attack on Johann von Klenau's force at Aspern, which was backed up by 60 well-placed guns. French general Louis-Vincent-Joseph Le Blond de Saint-Hilaire also died as a result of injuries from the battle; his leg was torn off by a cannonball. The Austrians had also suffered similar casualties but had secured the first major victory against the French for over a decade. The victory demonstrated the progress the Austrian army had made since the string of catastrophic defeats in 1800 and 1805.