Why did Napoleon empire fall?
First French Empire
Following his retreat from Russia, Napoleon continued to retreat, this time from Germany. After the loss of Spain, reconquered by an allied army led by Wellington, the rising in the Netherlands preliminary to the invasion and the manifesto of Frankfort (1 December 1813)[14] which proclaimed it, he had to fall back upon the frontiers of 1795; and then later was driven yet farther back upon those of 1792—despite the brilliant campaign of 1814 against the invaders. Paris capitulated on 30 March 1814, and the Delenda Carthago, pronounced against Britain, was spoken of Napoleon. The Empire briefly fell with Napoleon's abdication at Fontainebleau on 11 April 1814.
Waterloo (1970 film)
In 1814 French Emperor Napoleon Bonaparte, facing certain defeat at the hands of Britain, Austria, Prussia and Russia (the Sixth coalition), abdicates at the demand of his marshals. He is banished to Elba with 1,000 men, but escapes and returns to France. Ney, now serving the monarchy of Louis XVIII of France, is tasked with recapturing him, but he and his army defect to Napoleon. King Louis flees, Napoleon triumphantly enters Paris, and the European powers declare war.