Crimean War
Eastern question

As the Ottoman Empire steadily weakened during the 19th century, the Russian Empire stood poised to take advantage by expanding southward. In the 1850s, the British and the French Empires were allied with the Ottoman Empire and were determined to prevent that from happening. The historian A. J. P. Taylor argued that the war had resulted not from aggression, but from the interacting fears of the major players:

In some sense the Crimean War was predestined and had deep-seated causes. Neither Nicholas I nor Napoleon III nor the British government could retreat from the conflict for prestige once it was launched. Nicholas needed a subservient Turkey for the sake of Russian security; Napoleon needed success for the sake of his domestic position; the British government needed an independent Turkey for the security of the Eastern Mediterranean... Mutual fear, not mutual aggression, caused the Crimean War.
combination:two_responses, oulipo:avoid_letter[o]