On 19 November 1835, the brig
Lord Rodney, a hijacked European ship, arrived carrying 500 Māori armed with guns, clubs and axes, and loaded with 78 tonnes of seed potatoes, followed by another ship with 400 more Māori on 5 December 1835. While the second shipment of invaders were waiting,
the invaders killed a 12-year-old girl and hung her flesh on posts. They proceeded to enslave some Moriori and kill and cannibalise others. "Parties of warriors armed with muskets, clubs and tomahawks, led by their chiefs, walked through Moriori tribal territories and settlements without warning, permission or greeting. If the districts were wanted by the invaders, they curtly informed the inhabitants that their land had been taken and the Moriori living there were now vassals."
A
hui or council of Moriori elders was convened at the settlement called Te Awapatiki. Despite knowing of the Māori predilection for killing and eating the conquered, and despite the admonition by some of the elder chiefs that the principle of Nunuku was not appropriate now, two chiefs — Tapata and Torea — declared that "the law of Nunuku was not a strategy for survival, to be varied as conditions changed; it was a moral imperative." A Moriori survivor recalled : "[The Maori] commenced to kill us like sheep.... [We] were terrified, fled to the bush, concealed ourselves in holes underground, and in any place to escape our enemies. It was of no avail; we were discovered and killed - men, women and children indiscriminately."
A Māori conqueror explained, "We took possession... in accordance with our customs and we caught all the people. Not one escaped....."
The invaders ritually killed some 10% of the population, a ritual that included staking out women and children on the beach and leaving them to die in great pain over several days. The Māori invaders forbade the speaking of the Moriori language. They forced Moriori to desecrate their sacred sites by urinating and defecating on them.
After the invasion,
Moriori were forbidden to marry Moriori, or to have children with each other. All became slaves of the Ngati Tama and Ngati Mutunga invaders. Many Moriori women had children by their Māori masters. A small number of Moriori women eventually married either Māori or European men. Some were taken from the Chathams and never returned. In 1842 a small party of Māori and their Moriori slaves migrated to the subantarctic
Auckland Islands, surviving for some 20 years on sealing and flax growing. Only 101 Moriori out of a population of about 2,000 were left alive by 1862. Although the last Moriori of unmixed ancestry,
Tommy Solomon, died in 1933 there are several thousand mixed ancestry Moriori alive today.