During the Second World War it was used by the Ministry of Information as a venue for press conferences held by Winston Churchill and his ministers . This wartime role is marked by a commemorative plaque unveiled in 1991 . In 1940 it was the site of the assassination of Michael O'Dwyer , former Lieutenant Governor of the Punjab in India by Indian nationalist Udham Singh , as an act of revenge for the 1919 Amritsar massacre
1919 Amritsar massacre
Jallianwala Bagh massacre
Caxton Hall