The Crimean War, also known as the Russian War, pitched the allied nations of Britain, France, the Ottoman Empire and the Kingdom of Sardinia against the Russian Empire. At its simplest, the war was fought to prevent Russia gaining territorial control of various regions in eastern Europe, then under Ottoman control, and of routes into British India. These regions included the Black Sea, the Mediterranean, the Caucasus region and the Danubian provinces of modern-day Romania. Other more complex reasons included disputes over the control of religious sites and the protection of Christians in the Middle East, as well as concern over the declining influence of the Ottoman Empire and the growth of nationalism in various regions.

War with Russia had been publicly discussed for several years before Russian incursions into Romania, then under Ottoman control, led to a declaration of war from Constantinople in October 1853. Britain and France, fearing the collapse of the Ottoman Empire and the growth of Russian power, followed with their support for the Ottomans by declaring war on Russia at the end of March 1854.

The conflict began in Europe and could have ended there in July 1854 when Russia began to withdraw but the European allies decided to confront Russia directly by besieging the Russian port of Sevastopol, an important naval base on the Crimean peninsula. The allies landed in the Crimea on 14 September 1854 and made their way towards Sevastopol, encountering the Russians in several major battles en route including Alma (20 September), Balaklava (25 October) and Inkerman (5 November). On 9 September 1855, after numerous other battles and skirmishes, Sevastopol fell to the allies.