The 1927 Mahad march to a public tank triggered a club-and-stick caste counter-attack
Evidence
On the morning of the second day people decided to march to the Chavadar Tank and drink water. The privileged castes watched in horror as a procession of Untouchables walked through the town, four abreast, and drank water from the tank. After the shock subsided came the violent counter-attack, with clubs and sticks. Twenty Untouchables were injured. Ambedkar urged his people to stay firm and not to strike back. A rumour was deliberately spread that the Untouchables planned to enter the Veereshwar temple, which added a hysterical edge to the violence. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 324