Map of the opening of the salient, the start of the Battle of the Bulge (German: Wacht am Rhein, "Watch on the Rhine"). Map covers 16–25 December 1944. Map data, operation lines, etc. taken from File:P23(map).jpg, a US military source.
Front lines

  Front line, 16 December
  Front line, 20 December
  Front line, 25 December
Altitude and international borders

  Under 200m
  200–400m
  Above 400m
  International borders
Abbreviations

ID: Infantry Division
ABD: Airborne Division
AD: Armoured Division
BR: BritishMovements:

  Allied movements
  German movements
Armies are denoted in the largest type;
Corps are denoted in Roman numerals;
Allied divisions are shown in the smallest type.
Dashed lines denoted "XXXX" mark divisions between armies.
Dashed lines denoted "XXXXX" mark divisions between army groups.
This file was derived from:

 France blank.svg: 
P23(map).jpg: 
Wacht am Rhein map-Edit1.svg: File:Wacht am Rhein map-Edit1.svg
France_blank.svg: Eric Gaba (Sting - fr:Sting)
P23(map).jpg: US Military
w:File:Wacht am Rhein map-Edit1.svg: Matthewedwards
derivative work: Grandiose (talk)