This day in history

In London, more than 200 people are arrested during a National Front rally in Lewisham.

While the roots of the Cultural Revolution lie months before this, China announces the beginning of the Cultural Revolution on this day.
 

Polish – Soviet War: Start of the Battle of Warsaw, which the Polish eventually win.

In Sheffield, England Harry Brearley produces the first ever batch of stainless steel.

English commander, the Duke of Marlborough, wins the Battle of Blenheim in Germany, in which Anglo-Austrian forces under Marlborough and Prince Eugene defeat a combined French and Bavarian army.

Conquistador, Hernán Cortés, conquers Tenochtitlán, present day Mexico City. 

King Louis X of France marries Clemence d'Anjou.

Anglo-Dutch Treaty of 1814 is signed, requiring Britain to return Dutch colonial territories, but with Britain retaining land in South America.   

Politician Alexandros Panagoulis attempts to assassinate the Greek dictator Colonel Papadopoulos in Athens.