During this period Pākehā whaling stations became established in the region with Te Rauparaha's encouragement and the participation of many Māori. Some Māori women married Pākehā whalers and a lucrative two-way trade of supplies for muskets was established, thereby increasing Te Rauparaha's mana and military strength. By the early 1830s Te Rauparaha had defeated a branch of the Rangitane iwi in the Wairau Valley and gained control over that area. Te Rauparaha married his daughter Te Rongo to an influential whaling captain Captain John William Dundas Blenkinsop to whom he sold land in the Wairau Valley for a whaling station. It is uncertain if Te Rauparaha understood the full implications of the deed of sale that he signed and gave to the captain.