The latter soon began to come to a head. Austria had solidified its control over Lombardy-Venice and extended its protection to provinces nominally under the control of Francis' daughter Marie Louise. On 18 April Metternich announced that Austria was formally at war with Murat's Naples. Austria won the Battle of Tolentino on 3 May and captured Naples less than three weeks later. Metternich then was able to delay a decision on the future of the country until after Vienna. Discussions about Germany would drag on until early June when a joint Austrian-Prussian proposition was ratified. It left most constitutional issues to the new diet; its president would be Emperor Francis himself. Despite criticism from within Austria, Metternich was pleased with the outcome and the degree of control it granted Habsburgs, and, through them, himself. Certainly, Metternich was able to use the diet to his own ends on numerous occasions. The arrangement was similarly popular with most German representatives. A summation treaty was signed on 19 June (the Russians signed a week later), bringing the Vienna Congress officially to an end. Metternich himself had left on 13 June for the front line, prepared for a lengthy war against Napoleon. Napoleon, however, was defeated decisively at the Battle of Waterloo on 18 June.