Alarmed by Russian expansion into Ottoman territory along the Danube, Britain and France declared war on Russia, joining the Ottoman Empire in a conflict that would become infamous for the Siege of Sevastopol and the disastrous Charge of the Light Brigade. The Crimean War exposed catastrophic failures in military logistics and medical care, spurring reforms symbolized by Florence Nightingale's nursing work.
Russia's Tsar Nicholas I had cast himself as protector of Orthodox Christians within the crumbling Ottoman Empire, using that pretext to occupy the Danubian Principalities (modern Romania) in 1853. Britain and France, wary of Russian expansion threatening trade routes and the balance of power in Europe, initially hoped diplomacy would resolve the crisis. It didn't.
On March 28, 1854, London and Paris issued formal declarations of war, transforming what had been an Ottoman-Russian border conflict into a full European war. The fighting would shift to the Crimean Peninsula by autumn, producing the war's most infamous episodes: the year-long Siege of Sevastopol, the suicidal Charge of the Light Brigade at Balaclava, and appalling death tolls from disease and neglect in field hospitals.
The war's mismanagement became a scandal back home, prompting Florence Nightingale's pioneering work in battlefield nursing and sanitation, which laid foundations for modern nursing as a profession. Coverage by war correspondents like William Howard Russell of The Times, sent directly from the front, also helped establish investigative war journalism as a public accountability tool for the first time in British history.
Key people: Napoleon III, Queen Victoria