What advantages would the Allies gain by utilizing both airborne and seaborne divisions during the Normandy invasion in World War II? How was this dual strategy possible?

On april 20, 1814, the dethroned emperor left france for the isle of  elba, where he was exiled under the terms of the treaty of fontainebleau.napoleon  would be allowed to ruleelba, which had 12,000 inhabitants. perhaps cruelly, the treaty allowed him to retain the title "emperor."