 Complete the following phrase:  In 1775 Pirch began his career in the Prussian military, becoming a cadet in the Hessen-Kassel Nr. 45 infantry regiment. In 1787 he saw action in the Prussian invasion of Holland and in 1793 he participated in Siege of Mainz. He became a French prisoner for two years after Prussian defeat in Battle of Jena in 1806. When the War of the Sixth Coalition began Pirch was appointed commander of a brigade in April 1813. Serving under the Army of Bohemia, he fought in the battles of Lützen, Bautzen, 