Why did Metacom attack New England towns?

The war is named for Metacomet, the Wampanoag chief who adopted the name Philip because of the friendly relations between his father Massasoit and the Mayflower Pilgrims.[3] The war continued in the most northern reaches of New England until the signing of the Treaty of Casco Bay in April 1678.[4]

Massasoit had maintained a long-standing alliance with the colonists. Metacom (c. 1638-1676) was his younger son, and he became tribal chief in 1662 after Massasoit's death. Metacom, however, did not maintain his father's alliance between the Wampanoags and the colonists. The colonists insisted that the peace agreement in 1671 should include the surrender of Indian guns; then three Wampanoags were hanged for murder in Plymouth Colony in 1675 which increased the tensions. Indian 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 several individual 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 that New England had yet mustered, consisting of 1,000 militia and 150 Indian allies, and Governor Josiah Winslow marshaled them to attack the Narragansetts in November 1675. They attacked and burned Indian villages throughout Rhode Island territory, culminating with the attack on the Narragansetts' main fort in the Great Swamp Fight. An estimated 150 Narragansetts were killed, many of them women and children, and the Indian coalition was then taken over by Narragansett sachem Canonchet. They pushed back the colonial frontier in Massachusetts Bay, Plymouth, and Rhode Island colonies, burning towns as they went, including Providence in March 1676. However, the colonial militia overwhelmed the Indian coalition and, by the end of the war, the Wampanoags and their Narragansett allies were almost completely destroyed. Metacom fled to Mount Hope, where he was killed by the militia.