Napoleon left his exile on Elba and landed on the mainland near Cannes on 1 March 1815. He traveled north, with supporters flocking to his cause. On 16 March 1815 Louis XVIII addressed a meeting of both chambers, appealing to them to defend the constitutional charter. On the night of 19–20 March the king left his palace for Ghent in Belgium. Napoleon entered Paris on 20 March. He announced his ministers that day.
On 22 April 1815 the emperor announced changes to the constitution that defined the roles of the two chambers and of the ministers. On 1 June 1815 a major ceremony was held on the Champ de Mars in which the Emperor's authority was formally recognized. On 12 June 1815 Napoleon left Paris for the north, where the allied forces of Britain and Prussia were assembling. He was defeated at the Battle of Waterloo on 18 June 1815. Napoleon abdicated for the second time on 22 June 1815. That day the two chambers nominated the members of the French Provisional Government of 1815, which would serve as government until the second Bourbon Restoration.