Political map of Europe & the Mediterranean 13 March 1815 (Napoleon’s Return): Encouraged by news of tensions over the Congress of Vienna, Napoleon escaped from Elba (Principality of Elba) in March 1815, winning over French regiment after French regiment as he made his way back to Paris (Hundred Days). Alarmed, the European Powers at Vienna declared Napoleon an outlaw (Declaration at the Congress of Vienna), vowing to remove him from power once and for all.