“To George Washington from Maj. Gen. John Sullivan, 23 June 1777 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/03-10-02-0116. [Original source: The Papers of George Washington, Revolutionary War Series, vol. 10, 11 June 1777 – 18 August 1777, ed. Frank E. Grizzard, Jr. Charlottesville: University Press of Virginia, 2000, p. 116.]