The Jallianwala Bagh massacre in 1919 during a peaceful protest against the Rowlatt Act in Amritsar, British India, resulted in numerous casualties.
The public gathering prompted the British Indian Army's temporary brigadier general, R. E. H. Dyer, to surround the crowd with his Gurkha and Sikh infantry units.
At Jallianwala Bagh, surrounded by buildings on three sides, forces blocked the exit and fired at fleeing demonstrators until they ran out of bullets.
Between 379 to over 1,500 people were murdered and over 1,200 others were injured, with 192 needing major medical help. Britain expressed regret in 2019 but hasn't publicly apologized.