Starting in 1812 and presumably through 1813 Mount Tambora show its first signs of activity, producing earthquakes and releasing some ash and gas.
The main event happened in April of 1815 when a series of eruptions, culminating in the largest volcanic eruption in recorded history. The material released by the eruption lowered global temperatures, leading to what people in Europe and North America called the "year without a summer."
Lunar Society of Birmingham ended in 1813.
Napoleon's end can be attributed to a combination of factors, including his unsuccessful invasion of Russia in 1812, his defeat at the Battle of Leipzig in 1813, and his ultimate defeat at the Battle of Waterloo in 1815. These military setbacks, coupled with coalitions formed against him by various European powers, led to his downfall and exile.
The first patent for the tin can was obtained in 1810 by English inventor Peter Durand. It was based on work by Frenchman Nicolas Appert.
In Cuvier's essay on the Theory of the Earth (1813) he was interpreted to have proposed that new species were created after periodic catastrophic floods. In this way, Cuvier became the most influential proponent of catastrophism in geology in the early 19th century.
Humphrey Davy discovered that carbon and diamond were the same element in 1813 during his experiments on the electrolysis of molten salts. By passing an electric current through a mixture of molten salts and carbon, he was able to isolate elemental carbon, showing that diamond and carbon were chemically identical.
Truce of Pläswitz happened in 1813.
Battle of Möckern happened in 1813.
Lively Massacre happened in 1813.
Battle of Cúcuta happened in 1813.
Bashi Skirmish happened in 1813-10.
Battle of Pequereque happened on 1813-06-19.
Battle of Ordal happened on 1813-09-13.
Battle of the Nive happened on 1813-12-09.
Battle of Vilcapugio happened on 1813-10-01.
Battle of Sehested happened on 1813-12-10.
Battle of Dresden happened on 1813-08-27.
Raid at Altenburg happened on 1813-09-28.