Corsica and killings culminated in the assassination of Prefect Claude Érignac in 1998. In 2013, Corsica hosted the first three stages of the 100th Tour de France, which passed through the island for the first time in the event's 110-year history. Corsica was formed about 250 million years ago with the uplift of a granite backbone on the western side. About 50 million years ago sedimentary rock was pressed against this granite, forming the schists of the eastern side. It is the most mountainous island in the Mediterranean, a "mountain in the sea". It is also the fourth largest island in
Invasion of Corsica (1794) turned his attention to Corsica. Combining naval bombardments with amphibious landings of British soldiers and marines, and supported by Corsican irregulars, the British forces attacked the defences of San Fiorenzo, forcing the French to abandon the town and retreat to Bastia. Hood then led a force around the island and laid siege to the town, which surrendered after 37 days of blockade. This victory was sufficient for the Corsican people, through Paoli, to pledge allegiance to Britain. British reinforcements then laid siege to the last French-held fortress on the island, at Calvi, which was bombarded for two months, finally surrendering