Gandhiji's first great experiment in Satyagraha was accomplished in 1917 in Champaran, Bihar. The indigo cultivators of Champaran were greatly exploited by European planters. They were bound by law to grow indigo on 3/20th (the tinkathia system) of their land & sell it to the British planters at prices fixed by them. They invited Gandhiji to take up their case but the district authorities banned his entry to the district. He offered satyagraha as a result of which an inquiry was conducted into the conditions of the peasants. This helped in giving the indigo cultivators some relief.