- August 27, 0410 Visigothic sack of Rome ends after three days.
- August 27, 0663 “Remnants of the Korean Baekje Kingdom and their Yamato Japanese allies engage the combined naval forces of the Tang Chinese and Silla Koreans on the Geum River in Korea; the outcome is a significant Tang-Silla victory, while the Japanese would not attempt another invasion of Korea until the Imjin War of the late 16th century.”
- August 27, 1232 “The Formulary of Adjudications is promulgated by Regent Hj Yasutoki. (Traditional Japanese date: August 10, 1232)”
- August 27, 1667 Earliest recorded hurricane in US (Jamestown Virginia)
- August 27, 1689 The Treaty of Nerchinsk is signed by Russia and the Qing empire.
- August 27, 1725 “Guillaume de Chazel, drowns in wreck of payship ‘Le Chameau,’ which sinks 25 km from Louisbourg; found by 3 divers in May 1966, with gold and silver coins worth $700,000”
- August 27, 1758 “Colonel John Bradstreet 1714-1774 captures Fort Frontenac and its rich storehouses, as well as nine armed vessels with 100 guns, the total French naval force on Lake Ontario; British have only two wounded and not a single man killed”
- August 27, 1776 Americans lose to the British at the Batttle of Long Island.
- August 27, 1776 “Battle of Long Island, in present day Brooklyn, New York, British forces under General William Howe defeat Americans under General George Washington.”
- August 27, 1776 British defeat Americans in Battle of Long Island
- August 27, 1783 The first hydrogen balloon flight (unmanned); reaches 900 m altitude
- August 27, 1789 “French Natl Assembly issues “”Decl of the Rights of Man & the Citizen”””
- August 27, 1793 “French counter-revolution, port of Toulon revolts and admits the British fleet, which lands troops and seizes the port leading to Siege of Toulon.”
- August 27, 1798 “United Irishmen and French forces clash with the British army in the Battle of Castlebar, part of the Irish Rebellion of 1798.”
- August 27, 1813 “Napoleon defeats the Austrians, Russians and Prussians at the Battle of Dresden.”
- August 27, 1828 The Russians defeat the Turks at the Battle of Akhalzic.
- August 27, 1858 “Lincoln and Douglas debate at Freeport, IL.”
- August 27, 1859 “Petroleum discovered in Titusville, Pennsylvania. World’s first successful oil well.”
- August 27, 1859 “Successful oil well drilled, near Titusville, Penn”
- August 27, 1861 “Union forces attack Cape Hatteras, North Carolina”
- August 27, 1883 “Krakatoa, an Indonesian volcano, erupts. It is one of the most violent volcanic events in modern times.”
- August 27, 1883 “Krakatoa, west of Java, explodes with a force of 1,300 megatons”
- August 27, 1892 The Metropolitan Opera House in New York City is heavily damaged by fire.
- August 27, 1896 Anglo-Zanzibar War: the shortest war in world history (09:00 to 09:45) between the United Kingdom and Zanzibar.
- August 27, 1896 Zanzibar loses to England in a 38 minute war (9:02 AM-9:40 AM)
- August 27, 1900 British defeat Boer commandos at Bergendal.
- August 27, 1909 Jack Chesbro’s final Yankee game
- August 27, 1912 Edgar Rice Burroughs publishes Tarzan of the Apes.
- August 27, 1913 “Lt Peter Nestrov, of Imperial Russian Air Service, performs a loop in a monoplane at Kiev (1st aerobatic maneuver in an airplane)”
- August 27, 1917 Squadron of minesweepers departs U.S. for service off France
- August 27, 1918 Dr Joseph L Johnson named minister to Liberia
- August 27, 1918 “Lt-Colonel William H. CLark-Kennedy (24th Cdn. Infantry Batt.) wins the Victoria Cross at Fresnes-Rouvroy, France”
- August 27, 1920 “Radio Argentina begins regularly scheduled transmissions from the Teatro Coliseo in Buenos Aires, considered the world’s first public broadcast station.”
- August 27, 1921 J E Clair of Acme Packing Co of Green Bay granted an NFL franchise
- August 27, 1927 “Parks College, America’s oldest aviation school, opens”
- August 27, 1928 16 die in a NYC subway’s 2nd worst accident
- August 27, 1928 “Kellogg-Briand Pact, outlawing war, signed by sixty nations.”
- August 27, 1928 “Kellogg-Briand Pact, where 60 nations agree to outlaw war”
- August 27, 1937 George E.T. Eyston sets world auto speed record at 345.49 MPH
- August 27, 1939 Erich Warsitz makes first jet-propelled flight (in a Heinkel He-178)