Meanwhile, to keep up the appearance that his visit was solely for the purposes of trade, Te Rauparaha had allowed several of his leading chiefs to enter the fortress, where they traded muskets and ammunition for greenstone. Among them was Te Pēhi Kupe, Te Rauparaha's uncle, a notable warrior who only a few years previously in 1824, had made a voyage to England mainly to obtain European weapons. An altercation began as Te Pehi tried to take off a block of greenstone that the owner wished to keep. Then Rongotara, one of the Kaiapoi chiefs, noticed that Pokitara, one of the leading Ngāti Toa, was about to enter the pā. In anger at the fact that his daughter, captured at Omihi, had been allotted to Pokitara as a slave, Rongotara killed Pokitara as he stooped to come under the gate. Then followed a general slaughter of the Ngāti Toa within the pā. Eight chiefs — including Te Pehi Kupe — were killed.