colonized by several communities. After a trial before justices appointed for the purpose, the General Court decided it could not honor the claim, as no one then knew the location of the Naumkeag River, and in any case Mason's grant had been included in another. It did assess a nominal quit-rent fee of a few shillings on land-holders undeniably within the tract; that is, as far south as Ipswich. Division of the island Ipswich, Massachusetts, was incorporated as Ipswich in 1634 by settlers of the previous year from the Massachusetts Bay Colony. In 1635 another group from England passed through Ipswich to settle and incorporate Newbury, Massachusetts. In 1639 a third group from England was granted the remaining land between Newbury and Ipswich and incorporated Rowley, Massachusetts. There is no official record of the use of Plum Island until then, although Smith's glowing report had included the marsh grass, an enticing feature for herdsmen. A document of January 2, 1639, survives, however, by which Robert Wallis and Thomas Manning of Ipswich agree to maintain a common herd of 48 hogs on Plum Island starting on April 10 and running to the end of the harvest. One of them was always to be present. Reaction of the other communities was immediate. Newbury filed a petition with the General Court of Massachusetts for ownership of the entire island. The petition was denied on March 13 with the proviso that Ipswich, Rowley and Newbury were allowed use of the island, which became a pasture for hogs, cattle and horses. In March 1649 Newbury again pressed for title to the island. It argued that "for three of four miles together there is no channel betwixt us and it." At low tide they drove wagons across. These arguments did not prevail; on October 17, 1649, the court finalized its temporary decision, apportioning 2/5 of the island to Newbury, 2/5 to Ipswich and 1/5 to Rowley. There is no hint in the court documents that they ever used a name other than Plum Island. The name is apparently of local origin; the journal of Margaret Smith (1678-9) relates: Leaving on our right hand Plum Island (so-called on account of the rare Plums which do grow upon it), we struck into the open Sea.... In 1776, during the American Revolutionary War, Fort Philip was built on the northern point of the island to defend the Merrimack River.