The Battle of Dürenstein (also known as the Battle of Dürrenstein, Battle of Dürnstein and Battle of Diernstein; German: Gefecht bei Dürrenstein), on 11 November 1805, was an engagement in the Napoleonic Wars during the War of the Third Coalition. Dürenstein (modern Dürnstein) is located in the Wachau Valley, on the River Danube, 73 kilometers (45 mi) upstream from Vienna, in Austria. The river makes a crescent-shaped curve between Dürnstein and nearby Krems an der Donau and the battle was fought in the flood plain between the river and the mountains.