Explanation

General Reginald Dyer is primarily known for the Jallianwala Bagh massacre

That took place on April 13, 1919, in Amritsar, India

He was a British military officer in the Bengal Army 

Years of service 1885–1920

Born: 9 October 1864 Murree, Punjab

Died: 23 July 1927 (aged 62), England