 Complete the following phrase:  Upon the establishment of the First French Empire, he was made one of the original eighteen Marshals of the Empire. In 1805, he fully regained Napoleons favour, which he lost during the consulate. At Austerlitz, he commanded the left wing of the Grande Armée. During the War of the Fourth Coalition, Lannes was at his best, commanding his corps with the greatest credit in the march through the Thuringian Forest, the 