Then in May 1846 fighting broke out in the Hutt Valley between the settlers and Te Rauparaha's nephew, Te Rangihaeata, another prominent Ngāti Toa war leader during the Musket Wars Despite his declared neutrality, Te Rauparaha was arrested after the British captured secret letters from Te Rauparaha which showed he was playing a double game. He was charged with supplying weapons to Māori who were in open insurrection. He was captured near a tribal village Taupo Pā in what would later be called Plimmerton, by troops acting for the Governor, George Grey, and held without trial under martial law before being exiled to Auckland where he was held in the ship Calliope. His son, Tāmihana, was studying Christianity in Auckland and Te Rauparaha gave him a solemn message that their iwi should not take utu against the government. Tāmihana returned to his rohe to stop a planned uprising. Tāmihana sold the Wairau land to the government for 3,000 pounds. Grey spoke to Te Rauparaha and persuaded him to give up all outstanding claims to land in the Wairau valley. Then, realising that Te Rauparaha was old and sick, Grey allowed him to return to his people at Ōtaki in 1848.