The Crimean War (1853-1856)

Tensions simmer over declining Ottoman power. Russia demands protection over all Orthodox Christians in the Ottoman Empire; France claims similar rights for Catholics. A dispute over the keys to the Church of the Nativity in Bethlehem escalates into a full diplomatic crisis between the great powers.

Russian Prince Menshikov is sent to Constantinople to demand the right to protect all Orthodox subjects of the Ottoman Sultan — effectively a protectorate over millions of Ottoman citizens. The Sultan, backed by British and French diplomatic pressure, refuses.

Russian forces cross the Pruth River and invade Moldavia and Wallachia (modern-day Romania), vassal states of the Ottoman Empire. The Ottoman Sultan declares war on Russia in October. Britain and France send warships to the Dardanelles.

The Russian Black Sea fleet under Admiral Nakhimov destroys 15 Ottoman warships at anchor in Sinop harbor, killing nearly 3,000 Turkish sailors. The one-sided battle is reported in British newspapers as a "massacre," inflaming public opinion against Russia and pushing Britain toward war.

After months of failed diplomacy, Britain and France formally declare war on Russia. The alliance aims to protect the Ottoman Empire, check Russian expansion toward the Mediterranean, and preserve the European balance of power.

British, French, and Ottoman forces land on the Crimean Peninsula. On September 20, they defeat the Russian army at the Battle of the Alma, opening the road to Sevastopol — Russia's main Black Sea naval base. The allies march south and begin siege operations.

During the Battle of Balaclava, a miscommunication leads Lord Cardigan's British Light Brigade to charge directly into Russian artillery positions. Of 670 cavalrymen, 110 are killed and 160 wounded. The disastrous charge is immortalized in Alfred Lord Tennyson's poem and becomes one of the most famous episodes in military history.

The allies besiege Sevastopol through a brutal Crimean winter. Logistical failures are catastrophic — soldiers lack adequate food, shelter, clothing, and medical supplies. Disease (cholera, dysentery, typhus) kills far more soldiers than combat. Florence Nightingale arrives at Scutari barracks hospital and introduces sanitation reforms, pioneering modern nursing and dramatically reducing mortality.

Known as the "soldiers' battle" due to thick fog that turned the fight into confused, small-unit engagements. Russian forces attempt to break the siege with a surprise attack. After brutal hand-to-hand fighting, the allies hold their positions but suffer heavy losses. Troops on both sides number in the tens of thousands.

Sardinia-Piedmont enters the war on the Allied side, sending 21,000 troops. Count Cavour seeks a seat at the post-war peace conference to advance the cause of Italian unification by gaining great-power recognition for Piedmont's ambitions.

After an 11-month siege, French forces capture the Malakoff redoubt — the key defensive position. Russian forces evacuate Sevastopol, sinking their own warships in the harbor and blowing up fortifications as they leave. The Russian defense had been heroic, but the city's fall effectively decides the war.

Peace is signed at the Congress of Paris. Terms include: Russia demilitarizes the Black Sea (no warships or naval arsenals); Russia surrenders the Danube Delta and Southern Bessarabia; the Ottoman Empire is admitted to the Concert of Europe; the powers jointly guarantee Ottoman independence and territorial integrity. Total military deaths are estimated at 450,000-600,000, with the majority dying from disease.