The Brunswicker Ducal Korp or "Herzoglich Braunschweigisches Korps" in its native german tongue were a military unit in the Napoleonic Wars.
Most units of the corps wore black uniforms, leading to the "black" nicknames of the unit. The Brunswickers wore a silvered skull badge on their hats "Totenkopf". The Brunswickers were awarded various nicknames by their contemporaries, including the Black Crows, the Black Legion and the Black Horde. However, although the uniforms of the individual units that comprised the corps were, as the names suggest, predominantly black, they varied in their details. Their title originated from Duke Frederick William of Brunswick-Lüneburg.
In 1806 the Duke of Brunswick-Lüneburg, Charles William Ferdinand, was fatally wounded during the Prussian defeat at the Battle of Jena-Auerstedt. Following Prussia's defeat and the collapse of the Fourth Coalition against Napoleon, his duchy remained under French control. Rather than permit the Duke's heir, Frederick William, to succeed to his father's title, Napoleon seized the duchy and, in 1807, incorporated it into his newly created model Kingdom of Westphalia ruled by his brother Jérôme. Two years later in 1809 the Fifth Coalition against Napoleon was formed between the Austrian Empire and the United Kingdom. The dispossessed Frederick William, who had been a strenuous critic of French domination in Germany, seized this opportunity to seek Austrian help to raise an armed force. To finance this venture he mortgaged his principality in Oels. In its initial incarnation (dated to 25 July 1809), the 2300-strong 'free' corps consisted of two battalions of infantry, one Jäger battalion, a company of sharpshooters, and a mixed cavalry contingent including Hussars and Uhlans.
