He was made a Count of the Empire in 1808 and received a divisional command in the Army of Germany, with which he would campaign in southern Germany and Austria. On 22 April 1809, Saint-Hilaire distinguished himself under Napoleon's eyes at the Battle of Eckmühl.
He was elevated to the rank of Count of the Empire in 1808 and given command of a division within the German Army, leading campaigns in southern Germany and Austria. On April 22, 1809, Saint-Hilaire distinguished himself under Napoleon's supervision at the Battle of Eckmühl.