This day in history

'Bloody Sunday': British troops shoot dead 13 people during a demonstration in Londonderry, Northern Ireland. The troops argued that they opened fire in response to shots from gunmen in a nearby block of flats.
 

The Beatles' perform in public together for the last time, on the roof of Apple Records in London.
 

The Vietnam War: Communist forces launch the Tet Offensive, a series of coordinated surprise attacks across South Vietnam.
 

Adolf Hitler becomes Chancellor of Germany.
 

In Britain, the House of Lords rejects Irish Home Rule Bill.
 

In England, Oliver Cromwell is posthumously executed. His severed head is displayed on a pole outside Westminster Abbey until 1684.