“To George Washington from Brig. Gen. Peter Muhlenberg, 10 December 1779,” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/03-23-02-0431. [Original source: The Papers of George Washington, Revolutionary War Series, vol. 23, 22 October–31 December 1779, ed. William M. Ferraro. Charlottesville: University of Virginia Press, 2015, p. 571.]