March 28

German astronomer Heinrich Olbers discovers the asteroid Pallas, the second asteroid ever found.

German astronomer Heinrich Wilhelm Olbers, an amateur observer who also discovered several comets, identified Pallas, the second asteroid ever found after Ceres the previous year. Both objects were initially classified as new planets before astronomers gradually recognized, as more similar bodies were discovered, that they belonged to a much larger population of minor planets orbiting between Mars and Jupiter.

The Royal Navy captures two American warships at the Battle of Valparaíso.

HMS Phoebe and HMS Cherub cornered the USS Essex in neutral Chilean waters during the War of 1812, forcing its surrender after a fierce engagement that crippled the American frigate's rigging and guns. The victory ended a successful raiding campaign by the Essex against British whaling ships in the Pacific.

Britain and France declare war on Russia, entering the Crimean War.

Britain and France formally declared war on Russia in response to Russian expansion into Ottoman territories, entering the Crimean War in support of the Ottoman Empire. The brutal conflict, notable for the logistical failures exposed by war correspondents, later prompted major military and medical reforms.

Britain and France declare war on Russia, beginning the Crimean War.

The declarations followed Russia's occupation of Ottoman territories along the Danube and its destruction of an Ottoman fleet, moves that Britain and France saw as a threat to the balance of power in Europe. The resulting war, fought largely in the Crimean Peninsula, brought heavy casualties and prompted major reforms in military medicine, notably through Florence Nightingale's work.

British colonial forces clash with Māori fighters at the Battle of Waireka in New Zealand.

Fought early in the First Taranaki War, the battle saw British troops and colonial militia engage Māori defenders near New Plymouth after tensions over disputed land sales escalated into armed conflict. Waireka was among the opening engagements of the New Zealand Wars, a series of conflicts between the Crown and Māori that shaped the colony for decades.

The Paris Commune formally establishes its governing council after the March 18 uprising.

Following the earlier armed uprising in Paris, the Commune's governing council was formally installed after an election, establishing a radical municipal government that pursued socialist and secular reforms before being crushed by French national forces in the "Bloody Week" that May.

The Turkish cities of Constantinople and Angora are officially renamed Istanbul and Ankara.

As part of sweeping modernization and secularization reforms pursued by Mustafa Kemal Ataturk, Turkey's government officially adopted the names Istanbul and Ankara for the cities long known internationally as Constantinople and Angora, requiring foreign postal services to use the updated names. The change was part of a broader effort to forge a distinct, modern Turkish national identity.

An Imperial Airways biplane is destroyed by sabotage, the first airliner lost to a deliberate act.

The aircraft, flying a scheduled route for Britain's national airline, crashed after a fire believed to have been deliberately set broke out mid-flight over Belgium, killing everyone aboard. The disaster is regarded as the earliest confirmed case of a commercial airliner brought down by sabotage rather than accident or mechanical failure.

Madrid falls to Nationalist forces under Francisco Franco, effectively ending the Spanish Civil War.

Nationalist forces under General Francisco Franco entered Madrid unopposed after the city's remaining Republican defenders, exhausted and divided by internal factional fighting, surrendered without further resistance. The fall of the capital effectively ended the nearly three-year Spanish Civil War, and Franco went on to rule Spain as an authoritarian dictator for the next thirty-six years.

Nationalist forces under Francisco Franco capture Madrid, effectively ending the Spanish Civil War.

After a grinding siege lasting nearly three years, Republican resistance in the capital finally collapsed, and Franco's Nationalist troops entered the city just days before the war's official end was declared. The victory cemented Franco's dictatorship, which would rule Spain under authoritarian control for the next thirty-six years.

British and Australian forces defeat the Italian navy at the Battle of Cape Matapan in the Mediterranean.

In one of the few major Allied naval victories in the Mediterranean theater during World War II's early years, British and Australian warships decisively defeated the Italian fleet near the Greek coast at the Battle of Cape Matapan, sinking several cruisers and destroyers.

British and Australian naval forces defeat the Italian fleet at the Battle of Cape Matapan.

Aided by decrypted Italian signals intelligence, a Royal Navy force under Admiral Andrew Cunningham ambushed and destroyed several Italian cruisers and destroyers off the coast of Greece. The battle crippled the Italian navy's surface fleet and secured British naval dominance in the eastern Mediterranean for much of the rest of the war.

British commandos disable the Louis Joubert dry dock at Saint-Nazaire in a daring raid.

In Operation Chariot, an obsolete destroyer packed with explosives was rammed into the dock gates and detonated after commandos stormed the port facilities, denying Germany's battleship Tirpitz any dry dock on the Atlantic coast. The raid, though costly in lives, became one of the most celebrated commando operations of the Second World War.

A partial meltdown occurs at the Three Mile Island nuclear power plant in Pennsylvania, the worst nuclear accident in U.S. history.

A combination of mechanical failure and operator error caused a partial meltdown of a reactor core at the Three Mile Island nuclear plant near Harrisburg, Pennsylvania, releasing small amounts of radioactive gas. The accident became the worst commercial nuclear incident in U.S. history and reshaped public attitudes toward nuclear power.

The House of Commons passes a vote of no confidence in James Callaghan's government.

Losing by a single vote after the collapse of support from smaller parties following the 'Winter of Discontent' strikes, Callaghan's Labour government became the first to fall this way since 1924. The defeat triggered a general election that brought Margaret Thatcher and the Conservatives to power the following May.

Nelson Mandela is elected deputy president of the African National Congress.

Nelson Mandela, having been released from prison the previous year after 27 years of incarceration, was elected deputy president of the African National Congress, positioning him as the organization's leading figure ahead of South Africa's transition to democratic, multiracial elections.

American A-10 aircraft mistakenly attack British tanks in Iraq, killing one soldier.

The attack near Basra during the early days of the Iraq War struck Household Cavalry vehicles that had been marked as coalition forces, highlighting persistent difficulties in battlefield identification between allied units. The incident prompted a formal inquiry and renewed scrutiny of coalition procedures for avoiding fratricide.

A magnitude 8.6 earthquake strikes off the coast of Sumatra, Indonesia, killing over a thousand people.

A powerful undersea earthquake struck off the coast of Sumatra, Indonesia, killing over a thousand people and triggering fears of another major tsunami following the catastrophic Indian Ocean tsunami just three months earlier, though the resulting waves proved less devastating.

A magnitude 8.6 earthquake strikes off the coast of Sumatra, killing over 1,000 people.

The quake struck near Nias Island, just months after the catastrophic 2004 Indian Ocean earthquake and tsunami devastated the same region. Though it caused fewer casualties than its predecessor thanks to improved early warning and lower population density near the epicenter, it still caused widespread destruction and heightened fears across the Indian Ocean basin.

The Chelyabinsk-sized asteroid 2014 FR is discovered, part of ongoing efforts to track near-Earth objects.

Astronomers cataloged the small near-Earth asteroid 2014 FR as part of ongoing international survey efforts to identify and track potentially hazardous objects whose orbits bring them close to our planet. Such cataloging work, using ground-based telescopes and automated detection systems, reflects the growing global emphasis on planetary defense following several high-profile close approaches and impact events in preceding years.