Minor naval skirmishes also occurred in the Far East, where at Petropavlovsk on the Kamchatka Peninsula a British and French Allied squadron including HMS Pique under Rear Admiral David Price and a French force under Counter-Admiral Auguste Febvrier Despointes besieged a smaller Russian force under Rear Admiral Yevfimy Putyatin. In September 1854, an Allied landing force was beaten back with heavy casualties, and the Allies withdrew. The Russians escaped under the cover of snow in early 1855 after Allied reinforcements arrived in the region.
The Russians escaped under the cover of what in 1855?
snow