Who were the combatants in the Crimean War?
Russia [July 1853 the Russian Army invaded Moldavia and Walachia (Rumania)].
Ottoman Empire (Turkey) [October 1853 declared war on Russia].
Britain [February 1854 first British troops set sail for the East followed by British Baltic Fleet].
France [March 1854 first French troops set sail for the East followed by French Baltic Fleet].
Kingdom of Piedmont (Sardinia) [January 1855 joined the Allies].
France and Britain declared war on Russia 28 March 1854 and in April Austria and Prussia declared neutrality.