“To George Washington from Maj. Gen. John Sullivan, 11 February 1777 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/03-08-02-0334. [Original source: The Papers of George Washington, Revolutionary War Series, vol. 8, 6 January 1777 – 27 March 1777, ed. Frank E. Grizzard, Jr. Charlottesville: University Press of Virginia, 1998, p. 313.]