Which British General was responsible for the Jallianwala Bagh massacre?

The Jallianwala Bagh massacre, also known as the Amritsar massacre, was one of the horrible incidents in Indian history during the reign of Britishers. On 13 April 1919, the troops of the British Indian Army under the command of Colonel Reginald Dyer fired rifles into the crown of Indians, gathered in Jallianwala Bagh, Amritsar, Punjab.