 Following action in the Danubian Principalities and in the Black Sea, allied troops landed in Crimea in September 1854 and besieged the city of Sevastopol, home of the Tsar's Black Sea Fleet and the associated threat of potential Russian penetration into the Mediterranean.After extensive fighting throughout Crimea, the city fell on 9 September 1855.The war devastated much of the economic and social infrastructure of Crimea.