The III Corps of the "Grande Armée" was a French military unit that existed during the Napoleonic Wars. The corps came to prominence between 1805 and 1809 under the command of Marshal Louis-Nicolas Davout, when it repeatedly scored impressive victories single-handedly or in conjunction with other French forces. Napoleon called it "My tenth legion", in reference to Julius Caesar's finest unit, the X Equestris. Troops from III Corps then took part in many battles in Poland, during the War of the Fourth Coalition, e.g. Czarnowo, Pultusk, Golymin, Eylau, in Bavaria at Teugen-Hausen and Eckmuhl, and in Austria at Wagram in 1809. These troops were later reorganized as the I Corps and included French, German, and Polish units. It also included the 127th to 129th "régiment d'infanterie de ligne" from the North German countries of Oldenburg, Bremen, and Hamburg that were annexed shortly before and thus counted as French.