 Complete the following phrase:  On 5 June 1723, at the request of his father, nine-year-old Friedrich von Platen was appointed cornet by King Friedrich Wilhelm I of Prussia; and on 18 August 1729, he became a second lieutet; on 7 July 1730, he became a first lieutet. On 11 August 1736, he received his own company in the Cuirassier Regiment Gessler No. 4. In the same year, he was accepted into the Johanniterorden in Sonnenburg. At the beginning of the First Silesian War also called the War of Austrian Succession, he was Rittmeister, a captain of cavalry. His regiment was late for the Battle of Mollwitz but, in 1742, his regiment was involved in the thick of action at the 