Crimean War

The Crimean War grew out of long-running rivalry between the Russian Empire and the declining Ottoman Empire, framed contemporaneously as the "Eastern Question." The immediate trigger was a dispute over the rights of Orthodox Christians in the Holy Land, which Russia used to press claims over Ottoman territory. After Russian forces occupied the Danubian Principalities (Moldavia and Wallachia) in 1853, the Ottomans declared war in October 1853. Britain and France, fearing Russian expansion toward the Mediterranean and the Straits, entered the war in March 1854, joined later by the Kingdom of Sardinia in 1855.

Most major operations took place on the Crimean Peninsula, where allied forces laid siege to the Russian naval base at Sevastopol for roughly a year before its fall in September 1855. The war is remembered for several landmark episodes and figures: the Battle of Balaclava (1854) and its Charge of the Light Brigade; the nursing work of Florence Nightingale and Mary Seacole at Scutari, which reshaped military medicine; early use of the telegraph, railways, and rifled firearms; and pioneering war photography by Roger Fenton and battlefield reporting by William Howard Russell of The Times.

The conflict ended with the Treaty of Paris (1856), which:

• Guaranteed the integrity of the Ottoman Empire and admitted it formally to the "Concert of Europe."
• Demilitarized the Black Sea, barring Russian and Ottoman warships and coastal arsenals.
• Required Russia to cede southern Bessarabia and renounce its claim to protect Ottoman Christians.
• Affirmed free navigation of the Danube under an international commission.

Casualties are estimated at several hundred thousand, with disease killing far more troops than combat. The war exposed Russian institutional weakness, helping prompt Tsar Alexander II's reforms including the 1861 emancipation of the serfs, and it disrupted the post-Napoleonic balance forged at the Congress of Vienna.