After arriving in India in 1915, Gandhiji successfully organised Satyagraha (which he had applied in South Africa), in various parts of India.
The idea of Satyagraha consists of
(i) The idea of Satyagraha emphasised the power of truth and the need to search for truth.
(ii) This idea suggested that if the cause was true, if the struggle was against injustice, then physical force was not necessary to fight the oppressor. Without being aggressive, the Satyagrahi could win the battle.
(iii) This could be achieved by appealing to the conscience of the oppressor.
(iv) By this struggle, truth was bound to triumph ultimately. Gandhiji believed that this dharma of non-violence could unite all Indians.