December Footnote 6: "on the 16th"

Kruger had launched his original attack on December 16 at an area just below the Schnee Eifel defended by Colonel Nelson's 112th Regiment.  Like the other 28th Division regiments, the 112th put up a stubborn defense, delaying Kruger's entire corps for two days.  But on December 18, Nelson had been forced to drift to the northwest, where he eventually joined with the defenders of St. Vith.

Toland, Battle: the Story of the Bulge, 173.