Reginald Dyer was a British Army officer known for his role in the Jallianwala Bagh massacre in 1919. He was the military commander in Amritsar, India, during a time of significant unrest against British colonial rule. Dyer ordered troops to open fire on a large crowd of unarmed Indian civilians, resulting in hundreds of deaths and injuries. Dyer's actions were controversial and sparked widespread debate about British colonial policies. While some supported his decision as a means to restore order, many condemned it as a brutal act of repression. His legacy remains a topic of discussion in the context of British colonial history.