John Waldo was a soldier in King Philip's War, and served under Captain Thomas Wheeler in the fight at Quaboag (now Brookfield, Massachusetts), August 2, 1675. Captain Wheeler's "Narrative," after describing the battle and naming those killed, relates that:"... the fifth was John Waldo, of Chelmsford, who was not so dangerously wounded as the rest." For this service John Waldo was credited on November 30, 1675. Later, February 29, 1676, John Waldo was again credited, for service at Groton Garrison under Captain Wheeler. This apparently ended his military service, except that, in 1682, he and his brother Daniel were employed by the town of Dunstable as a mounted guard against the Indians. He probably moved from Ipswich to Chelmsford with his father, and later settled in Dunstable, where he, his brother Daniel, and Cornelius Waldo, who may have been his brother or his father, were early settlers. He was certainly living at Dunstable in 1682, for, on May 29, 1682, "John Waldo of Dunstable, Husbandman," purchased a Grist Mill from Thomas Smith of Boston. He represented the town of Dunstable in the General Court at the May session, 1689. About this time, probably, he moved to Boston; though he may have been living there at an earlier date for September 21, 1684, Rebecca Waldo, who may have been his sister, but was probably his wife, was admitted into the Second Church, Boston. He was of Boston," Having sold the mill at Hingham, on November 29, 1697 he purchased from John Broughton of Windham, Connecticut, a gristmill and mill works, with dwelling-house and one acre of land at Windham. In the deed Waldo is called of Boston; but he must have immediately moved to Windham, if he was not already there, since he was admitted an inhabitant of Windham, January 30, 1697-8, and on the same date was placed on a committee, with Joseph Hall and John Backus, to gather the rate and agree with workman "to build a meeting house."