The Crimean war was fought from 1853-1856. The UK National Archives summarizes:
In Britain, the Crimean War is principally remembered for three reasons: the Charge of the Light Brigade, maladministration in the British army, and Florence Nightingale. However, this war, fought by an alliance of Britain, France, Turkey and Sardinia against Russia, is far more complex.
Many wars have been fought on the grounds of the strategic importance of a region; many wars have been fought over religious differences. The Crimean War was the result of both factors.