This Day In History

December 6
1240
Mongol invasion of Rus: Kiev under Danylo of Halych and Voivode Dmytro falls to the Mongols under Batu Khan.
1768
The first edition of the Encyclopædia Britannica is published.
1941
World War II: The United Kingdom declares war on Finland in support of the Soviet Union during the Continuation War.
1971
Pakistan severs diplomatic relations with India following New Delhi's recognition of Bangladesh.
1992
The Babri Mosque in Ayodhya, India is demolished, leading to widespread riots causing the death of over 1500 people.