 Complete the following phrase:  The VI Corps was reconstituted for the invasion of Russia and placed under the command of General Laurent de Gouvion Saint-Cyr. The corps was composed entirely of Bavarian soldiers. At the First Battle of Polotsk on 16 to 18 August 1812, the Bavarians and the French II Corps together suffered 6,000 casualties, including Bavarian Generals Bernhard Erasmus von Deroy and Siebein killed, and Vincenti and Raglowitsch wounded. Saint-Cyr won his marshals baton for this costly victory. The corps fought in the 