 Complete the following phrase:  In 1811, Rottembourg was promoted to general of brigade and fought in the French invasion of Russia in 1812 before being sent home to organize units of the Imperial Guard. In 1813, he led a Young Guard brigade at Bautzen and an Old Guard brigade at Leipzig. Late that year he became a general of division. In 1814, he led a Young Guard division at La Rothière, Mormant, 