The Jallianwala Bagh massacre took place on April 13, 1919 when British Indian army soldiers fired rifles into a crowd of unarmed Indians who had gathered for a peaceful protest in Jallianwala Bagh in Amritsar, Punjab. Brigadier General Reginald Dyer ordered his men to fire on the crowd for about ten minutes, killing hundreds of men, women and children who had no way to escape. Udham Singh later avenged the massacre by assassinating Michael O'Dwyer, who had supported Dyer's actions. A memorial was built on the site in 1961 to honor those killed.