The Battle of Aspern-Essling took place from May 21 to May 22, 1809, during the War of the Fifth Coalition. It was fought between the forces of Napoleon Bonaparte and the Austrian Empire near the towns of Aspern and Essling, close to Vienna. This battle marked the first significant defeat for Napoleon in his military career, as he faced strong resistance from the Austrian troops led by Archduke Charles. The battle was characterized by intense fighting and heavy casualties on both sides. The Austrians successfully defended their positions, forcing Napoleon to retreat. This engagement demonstrated the effectiveness of the Austrian army and shifted the momentum of the campaign, leading to further confrontations in the ongoing conflict between France and Austria.