Political map of South & Southwest Asia 13 April 1919 (Amritsar Massacre): Despite the end of World War I, the British remained concerned about the threat of revolutionary activity in India and decided to extend the emergency powers they had enacted during the war (Rowlatt Act). This only exacerbated tensions with the Indian population, peaking in April 1919 when British Indian Army troops opened fire on unarmed protesters at Amritsar (Amritsar Massacre), causing thousands of casualties.