Events on April 18 37
Year 796
King Æthelred I of Northumbria is murdered in Corbridge by a group led by his ealdormen, Ealdred and Wada. The patrician Osbald is crowned, but abdicates within 27 days.
Year 1232
The Spanish town of Arjona declares independence and names its native Muhammad ibn Yusuf as ruler. This marks the Muhammad's first rise to prominence; he would later establish the Nasrid Emirate of Granada, the last independent Muslim state in Spain.
Year 1521
Trial of Martin Luther begins its second day during the assembly of the Diet of Worms. He refuses to recant his teachings despite the risk of excommunication.
Year 1775
American Revolution: The British advancement by sea begins; Paul Revere and other riders warn the countryside of the troop movements.
Year 1847
American victory at the battle of Cerro Gordo opens the way for invasion of Mexico.
Year 1857
"The Spirits Book" by Allan Kardec is published, marking the birth of Spiritualism in France.
Year 1864
Battle of Dybbøl: A Prussian-Austrian army defeats Denmark and gains control of Schleswig. Denmark surrenders the province in the following peace settlement.
Year 1899
The St. Andrew's Ambulance Association is granted a royal charter by Queen Victoria.
Year 1902
The 7.5 Mw Guatemala earthquake shakes Guatemala with a maximum Mercalli intensity of VIII (Severe), killing between 800-2,000.
Year 1912
The Cunard liner RMS Carpathia brings 705 survivors from the RMS Titanic to New York City.
Year 1915
French pilot Roland Garros is shot down and glides to a landing on the German side of the lines during World War I.
Year 1942
World War II: The Doolittle Raid on Japan: Tokyo, Yokohama, Kobe and Nagoya are bombed.
Year 1943
World War II: Operation Vengeance, Admiral Isoroku Yamamoto is killed when his aircraft is shot down by U.S. fighters over Bougainville Island.
Year 1946
The International Court of Justice holds its inaugural meeting in The Hague, Netherlands.
Year 1949
The keel for the aircraft carrier USS United States is laid down at Newport News Drydock and Shipbuilding. However, construction is canceled five days later, resulting in the Revolt of the Admirals.
Year 1955
Twenty-nine nations meet at Bandung, Indonesia, for the first Asian-African Conference.
Year 1980
The Republic of Zimbabwe (formerly Rhodesia) comes into being, with Canaan Banana as the country's first President. The Zimbabwean dollar replaces the Rhodesian dollar as the official currency.
Year 1983
A suicide bomber in Lebanon destroys the United States embassy in Beirut, killing 63 people.
Year 1988
The United States launches Operation Praying Mantis against Iranian naval forces in the largest naval battle since World War II.
Year 1992
General Abdul Rashid Dostum revolts against President Mohammad Najibullah of the Democratic Republic of Afghanistan and allies with Ahmad Shah Massoud to capture Kabul.
Year 1996
In Lebanon, at least 106 civilians are killed when the Israel Defense Forces shell the United Nations compound at Quana where more than 800 civilians had taken refuge.
Year 2007
A series of bombings, two of them being suicides, occur in Baghdad, killing 198 and injuring 251.