Please answer a question about the following article about Ottoman Empire:

The Crimean War (1853–1856) was part of a long-running contest between the major European powers for influence over territories of the declining Ottoman Empire. The financial burden of the war led the Ottoman state to issue foreign loans amounting to 5 million pounds sterling on 4 August 1854. The war caused an exodus of the Crimean Tatars, about 200,000 of whom moved to the Ottoman Empire in continuing waves of emigration. Toward the end of the Caucasian Wars, 90% of the Circassians were ethnically cleansed and exiled from their homelands in the Caucasus and fled to the Ottoman Empire, resulting in the settlement of 500,000 to 700,000 Circassians in Turkey.[page needed] Some Circassian organisations give much higher numbers, totaling 1–1.5 million deported or killed.

During what years did the Crimean War take place?
1853–1856