Why did General Dyer open fire?

General Dyer opened fire on the gathering at Jallianwala Bagh in order to strictly enforce Martial Law prevailing that was in effect at Amritsar during the time.

General Dyer also wanted to spread the message that there would be no disobedience to rule of the British colonials in India.

For more relevant articles, refer to the following links:

• Jallianwala Bagh Massacre
• Udham Singh
• Salt Satyagraha