Lal Singh was the commander of the Sikh army during the first Anglo Sikh war. The treachery of Lal Singh and Teja Singh helped the British to acquire Lahore without a single battle.
The Jallianwala Bagh massacre took place on 13 April 1919. The Acting Brigadier-General Reginald Dyer ordered troops of the British Indian Army to fire into the unarmed crowd. A total number of 379 people died and over 1,000 people injured.