Context: In 1853 the Russian Empire on behalf of the Slavic Balkan states began to question the very existence of the Ottoman Empire. The result was the Crimean War, 1853–1856, in which the British Empire and the French Empire supported the Ottoman Empire in its struggle against the incursions of the Russian Empire. Eventually, the Ottoman Empire lost control of the Balkan region.

Question: When did the Russian Empire begin to question the existence of the Ottoman Empire?
Answer: 1853

Question: When was the Crimean War?
Answer: 1853–1856

Question: During the Crimean War who did the British and French support?
Answer: the Ottoman Empire

Question: What was the Ottoman Empire's struggle against in the Crimean War?
Answer: the incursions of the Russian Empire

Question: The Ottoman Empire eventually lost control of what region?
Answer: the Balkan region