King Philip's War (sometimes called the First Indian War, Metacom's War, Metacomet's War, Pometacomet's Rebellion, or Metacom's Rebellion) was an armed conflict in 16751676 between indigenous inhabitants of New England and New England colonists and their indigenous allies. The war is named for Metacom, the Wampanoag chief who adopted the name Philip because of the friendly relations between his father Massasoit and the Mayflower Pilgrims. The war continued in the most northern reaches of New England until the signing of the Treaty of Casco Bay on April 12, 1678. Massasoit had maintained a long-standing alliance with the colonists. Metacom (c.16381676), his younger son, became tribal chief in 1662 after Massasoit's death. Metacom, however, forsook his father's alliance between the Wampanoags and the colonists after repeated violations by the colonists. The colonists insisted that the 1671 peace agreement should include the surrender of Native guns; then three Wampanoags were hanged in Plymouth Colony in 1675 for the murder of another Wampanoag, which increased tensions. Native raiding parties attacked homesteads and villages throughout Massachusetts, Rhode Island, Connecticut, and Maine over the next six months, and the colonial militia retaliated. The Narragansetts remained neutral, but some Narragansetts participated in raids of colonial strongholds and militia, so colonial leaders deemed them to be in violation of peace treaties. The colonies assembled the largest army New England had yet mustered, consisting of 1,000 militia and 150 Native allies. Governor Josiah Winslow marshaled them to attack the Narragansetts in November 1675. They attacked and burned Native villages throughout Rhode Island territory, culminating with the attack on the Narragansetts' main fort in the Great Swamp Fight. An estimated 600 Narragansetts were killed, and their coalition was taken over by Narragansett sachem Canonchet. They pushed back the borders of the Massachusetts Bay, Plymouth, and Rhode Island colonies, burning towns as they went, including Providence in March 1676. However, the colonial militia overwhelmed the Native coalition. By the end of the war, the Wampanoags and their Narragansett allies were almost completely destroyed. On August 12, 1676, Metacom fled to Mount Hope, where he was killed by the militia.

The war was the greatest calamity in seventeenth-century New England and is considered by many to be the deadliest war in Colonial American history. In the space of little more than a year, 12 of the region's towns were destroyed and many more were damaged, the economy of Plymouth and Rhode Island Colonies was all but ruined and their population was decimated, losing one-tenth of all men available for military service. More than half of New England's towns were attacked by Natives. Hundreds of Wampanoags and their allies were publicly executed or enslaved, and the Wampanoags were left effectively landless.King Philip's War began the development of an independent American identity. The New England colonists faced their enemies without support from any European government or military, and this began to give them a group identity separate and distinct from Britain.

The Great Swamp Fight or the Great Swamp Massacre was a crucial battle fought during King Philip's War between the colonial militia of New England and the Narragansett people in December 1675. It was fought near the villages of Kingston and West Kingston in the Colony of Rhode Island and Providence Plantations. The combined force of the New England militia included 150 Pequots, and they inflicted a huge number of Narragansett casualties, including many hundred women and children. The battle has been described as "one of the most brutal and lopsided military encounters in all of New England's history." Since the 1930s, Narragansett and Wampanoag people commemorate the battle annually in a ceremony initiated by Narragansett-Wampanoag scholar Princess Red Wing.