TIL of Udam Singh. When Michael O'Dwyer, the Governor of Punjab (British India) ordered the Jallianwala Bagh massacre against peaceful protestors which killed reportedly up to 1500, Udam got his revenge for India 21 years later when he travelled to London and assassinated Michael O'Dwyer

https://en.wikipedia.org/wiki/Udham_Singh

https://www.reddit.com/r/todayilearned/comments/156f9sy/til_of_udam_singh_when_michael_odwyer_the/