The Champ de Mars, or "Field of March," was a grand general assembly of Frank warriors, held from time to time in Gaul from the fifth century till the time of Charles le Chauve (877), when all trace of them disappears. The objects of these conventions were twofold: (1) that of military reviews, in which the freemen came to pay homage to their chief and bring their annual gifts; and (2) consultative deliberations upon what expeditions should be made, what should be done for the defence of the nation and what laws should be passed for the better government of the state. From 755 these assemblies were held in May. Napoleon I. announced a gathering to be held in the great plain, called the Champ de Mars of Paris, on May 26; but it was not held till June 1, 1815. The object was to proclaim L' Acte additionel aux constitutions de l'Empire.