“From George Washington to Robert Dinwiddie, 20 September 1757 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/02-04-02-0264. [Original source: The Papers of George Washington, Colonial Series, vol. 4, 9 November 1756 – 24 October 1757, ed. W. W. Abbot. Charlottesville: University Press of Virginia, 1984, p. 416.]