May 26 1879 Parihaka ploughing campaign begins.

The settlement at Parihaka not only attracted Maori from the Taranaki region but also members of iwi from other parts of the country. Most of them were escaping from conflict in their own tribal areas or were drawn by the teachings of Te Whiti and Tohu.
At Parihaka Te Whiti and Tohu began a campaign to resist European settlement of the land confiscated in South Taranaki from iwi who had fought against the Government.
In 1879, the Government sent surveyors out to survey to confiscated land on the Waimate plains,  south-east of Parihaka.
Parihaka followers disrupted the surveying by ploughing the land, pulling out survey pegs and building fences.
Many of the protestors were arrested and sent to the South Island where they were imprisoned without trial.
Despite the arrests- the protests continued.

Source: NZ History