August 27

The Visigothic sack of Rome, led by King Alaric I, concludes after three days of pillaging.

After breaching Rome's walls days earlier, Visigothic forces under King Alaric I concluded their sack of the city, having plundered its wealth over three days, an event that sent shockwaves throughout the Roman world as the first foreign capture of the city in centuries.

Henry the Young King and Margaret of France are crowned as junior monarchs of England.

Henry, the eldest surviving son of King Henry II of England, was crowned as a junior co-king alongside his father in a controversial arrangement intended to secure succession, though the younger Henry's frustration with his limited actual authority later contributed to a significant family rebellion.

A combined Aragonese-Venetian fleet decisively defeats the Genoese navy at the Battle of Alghero.

A combined fleet from the maritime republics of Aragon and Venice decisively defeated the naval forces of rival Genoa near Alghero on the island of Sardinia, contributing to the broader struggle for Mediterranean commercial dominance among Italy's competing maritime powers.

Emmanuel Philibert secures his position as Duke of Savoy through military victory.

Following military conflict with rivals seeking to seize control of his territory, Emmanuel Philibert successfully secured and consolidated his hereditary claim to the Duchy of Savoy, later relocating the Savoyard capital from Chambery to Turin and beginning significant modernization of the state's administration, legal code, and military organization that strengthened Savoy's regional standing.

British forces under General William Howe outflank and defeat the Continental Army at the Battle of Long Island.

British forces under General William Howe executed a successful flanking maneuver against General George Washington's Continental Army positions on Long Island, forcing a costly American retreat that nearly resulted in the destruction of Washington's entire army early in the Revolutionary War.

Petroleum is discovered near Titusville, Pennsylvania, launching the modern commercial oil industry.

Edwin Drake's successful drilling operation near Titusville, Pennsylvania, struck oil at a shallow depth of roughly 69 feet using a pioneering drilling technique adapted from salt-well boring methods, launching the modern commercial petroleum industry. The subsequent regional oil boom transformed American energy production and rapidly established Pennsylvania as the birthplace of the global oil age.

A series of massive volcanic explosions nearly destroys the island of Krakatoa, generating tsunamis that kill tens of thousands.

A series of massive volcanic explosions tore apart most of the Indonesian island of Krakatoa, generating an eruption heard thousands of miles away and devastating tsunamis that killed tens of thousands of people across the surrounding coastal regions of Java and Sumatra.

The Anglo-Zanzibar War, the shortest recorded war in history, concludes in under an hour.

Following a diplomatic dispute over succession to the Zanzibari throne after the death of a British-favored sultan, Royal Navy warships bombarded the sultan's palace, destroying it within approximately 38 minutes and forcing the rival claimant's surrender, making the Anglo-Zanzibar War the shortest recorded war in documented military history.

The world's first jet-powered aircraft, the Heinkel He 178, completes its maiden flight in Germany.

Germany's Heinkel He 178, powered by a revolutionary turbojet engine developed by engineer Hans von Ohain, completed the world's first flight of a jet-propelled aircraft, though the technology's true military and commercial potential would not be fully realized for several more years.

Hurricane Irene strikes the U.S. East Coast, causing approximately $15.6 billion in damages.

Hurricane Irene made landfall along the U.S. East Coast, causing widespread flooding and significant wind damage across a dozen states stretching from North Carolina to New England, resulting in approximately $15.6 billion in total damage and dozens of storm-related deaths, prompting one of the largest coastal evacuations in American history at the time.