The delta's anti-colonial history is late, organised and almost entirely non-violent, and this is worth stating plainly rather than dressing up. There was no rising here in 1857; when the Thanjavur kingdom lapsed in 1855 the response was petition and litigation, not revolt. The region's one large mass action is the salt march to Vedaranyam in April 1930, which was chosen precisely because the coast here is a natural salt flat. Beyond it, the delta's contribution to the national movement ran through print, law and Congress organisation rather than through armed resistance — and through emigrants, since the labour that left this coast for Ceylon, Malaya, Burma and Natal carried the politics with it.
The Thanjavur lapse and the petitions against it1855–1862
On the death of Shivaji Bhonsle without a male heir in 1855 the East India Company applied the Doctrine of Lapse and ended the Thanjavur kingdom. The family's claims were pursued by memorial and litigation in Madras and London rather than by revolt, and the delta stayed quiet through 1857–58.
Outcome: The kingdom was not restored. The palace, the library and the family's personal property remained with the line.
The Vedaranyam salt march13–30 April 1930
C. Rajagopalachari led about a hundred selected volunteers on foot from Tiruchirappalli through Kumbakonam, Needamangalam and Thiruthuraipoondi to the salt swamps at Vedaranyam, some 150 miles, to break the salt law on the coast. Vedaranyam had been proposed by Sardar Vedaratnam Pillai, who arranged the route and the halts.
Outcome: Rajagopalachari was arrested at the Edanthevar salt swamp on 28 April and sentenced to six months; Rukmini Lakshmipathi, arrested at Vedaranyam, became the first woman imprisoned in the salt satyagraha; K. Kamaraj received two years. About 375 people were arrested across the district. Prisoners were released after the Gandhi–Irwin Pact of March 1931.