When news of the Jallianwala Bagh massacre spread, crowds took to the streets in many north Indian towns. There were strikes, clashes with the police, and attacks on government buildings. The government responded with brutal repression — people were flogged, forced to crawl on streets, and villages near Gujranwala were bombed.
Source: Chapter 2, Section 1.2 – The Rowlatt Act
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The question asks specifically about the Indian reaction, so focus on: (1) public outrage — strikes, protests, attacks on government buildings, and (2) government's brutal counter-response (which is part of the chain reaction). Examiners expect both the people's reaction and the repressive response as they are presented together in the textbook. Avoid writing about Dyer's action — that's the cause, not the reaction.