 Complete the following phrase:  Born in Mittau now Jelgava, Courland to a family of local Baltic Germans, von Rüdiger graduated from a local college in Mittau and in 1799 he joined the Semenovsky Regiment of Life Guards. Throughout his career he served in a number of other units and occupied a number of posts, including Warrant Officer of the Sumy Hussar Regiment 1800 and adjutant to General Peter von der Pahlen 1801. During the Napoleonic Wars he took part in the 