English: The German advance between 16 May and 21 May 1940. The red area denotes the territory captured by Germany during this time. The German field armies and Corps are shown in red. The operating area of the various Belgian, British, and French field armies and Army groups are shown in blue. The checkered white and blue area denotes the French Maginot Line. The commanders of the various units are shown under their respective formation. Solid lines represent the boundaries between each major unit. Dotted lines depict lines of advance. Key dates are shown in boxes.