 Complete the following phrase:  Blücher was one of the leaders of the war party in Prussia in 1805, and he served as a cavalry general in the disastrous campaign of 1806. At the double Battle of Jena-Auerstedt, Blücher fought at Auerstedt, repeatedly leading the charges of the Prussian cavalry, but without success. During the retreat of the broken armies, he commanded the rearguard composed of Frederick Louis, Prince of Hohenlohes corps. With the capitulation of the main body after the Battle of Prenzlau on 28 October, he found his march toward the north-east blocked. He led the remt of his corps away to the north-west. Reinforcing his numbers with a division previously commanded by Karl August, Grand Duke of Saxe-Weimar, Blücher and his new chief of staff, Gerhard von Scharnhorst, reorganised his forces into two small corps totaling 21,000 men and 44 cannons. Nevertheless, he was defeated by two French corps at the 