Gandhiji started the Satyagraha Movement in the year 1919. Satyagraha, which means "truth force" or "soul force," was a nonviolent resistance movement that Gandhi developed as a means to fight against injustice and oppression. It was during the year 1919 that the Jallianwala Bagh massacre occurred in Amritsar, where British troops opened fire on a peaceful gathering, killing hundreds of people. This event had a profound impact on Gandhi, and it marked the beginning of his active involvement in the Indian independence movement. Through the Satyagraha Movement, Gandhi promoted principles such as nonviolent resistance, civil disobedience, and truthfulness as powerful tools to challenge and transform oppressive systems.