the land part of the Philipsburg Manor, which extended from Spuyten Duyvil Creek to the Croton River in modern Westchester County. Philipse's wife died, and he remarried Olof Stevense Van Cortlandt's daughter, herself a widow. Philipse's daughter Eva later married Jacobus Van Cortlandt, who was Mrs. Philipse's brother. The land that Van Cortlandt Park now occupies was acquired by Van Cortlandt from Philipse in the mid-to-late 1690s. In 1699, Van Cortlandt dammed Tibbetts Brook in order to power a sawmill (and later, a gristmill,), creating Van Cortlandt Lake as a mill pond in the process. In 1732, Van Cortlandt acquired an additional parcel from the Tippett family. The estate was then passed on to Jacobus's son Frederick Van Cortlandt (1699–1749) and family in 1739; it was once a vast grain plantation. In 1748, Frederick built the Van Cortlandt House on the former Tippett property, but died before its completion. The Van Cortlandts did not primarily live in that house, instead staying in Manhattan most of the time. A family burial ground was created in 1749, later to be known as "Vault Hill." Frederick, who was buried in Vault Hill, had willed the massive home and surrounding lands to his son, James Van Cortlandt (1727–1787). The Van Cortlandt family land was used during the American Revolution by both the Loyalists and Patriots, owing to James's leadership role early on in the revolution. On May 30, 1775, the New York Provincial Congress placed James on a committee to create a report on whether it was feasible to build a fort near his family's house. British General William Howe made the house his headquarters on November 13, 1776, thus placing it behind British-held ground. The Van Cortlandts wished to stay neutral in the war, however. Later, the grounds were used by Patriot militia leaders Comte de Rochambeau, Marquis de Lafayette, and George Washington. The house itself was Washington's headquarters after his troops were defeated in the 1776 Battle of Long Island. That same year, Augustus Van Cortlandt hid city records under Vault Hill to protect them during the war, turning them over to the new American government after the war. It was in "Indian Field," at the present-day intersection of Van Cortlandt Park East and 233rd Street, that the Stockbridge militia was destroyed by the Queen's Rangers, and 38 Indians from the militia were killed in 1778. In 1781, Washington returned to the