 Complete the following phrase:  Louis-Victor-Léon de Rochechouart entered the Russian army at the rank of sous-lieutet and became aide de camp to the duke of Richelieu. He rose through the ranks, serving as a lieutet in the imperial guard, then aide de camp de lempereur Alexander I of Russia. From 1805 to 1812, he participated in the conquest of Bessarabia and Circassia, fought in Caucasia and Chechnya. When 