The Pequod (or Pequot) tribe of south-east Connecticut were in the middle of a violent bid to expand their territory when the Europeans began to settle Massachusetts, and relations with neighboring tribes were tense in the extreme. They saw the newcomers as a potential resource and sought to gain a monopoly on fur-trading with them. This resulted in fractious disputes with both the English and the Narragansett and Mohegan tribes which became violent in 1633 after the Pequot killed a number of settlers. War was officially declared on 1st May 1637, with an English-Mohegan alliance heading the charge against the Pequot. Just 26 days later, it escalated into one of the bloodiest events in American history: the Mystic massacre, in which the allies burnt down the Pequot settlement and slaughtered around 500 people, mainly women and children. Over the following week, over 200 more were hunted down and killed or captured and forced into slavery. On 21st September 1638, the Treaty of Hartford was ratified, depriving the few remaining Pequot of their land and identity and outlawing their very name. The effects of this lasted until the twentieth century when their descendants reorganized in Connecticut once more.