The Globe At War
As highly mobile German armies surged into the open countryside west
of the Meuse River in the center of the front the northern German
armies attacked relentlessly, effectively tying down the Allied
defenders on the Dyle River and preventing them from disengaging
quickly to deal with the emerging threat to their southern flank.
German panzer spearheads advanced over 30 miles per day. By May
20th, German tanks from the 2nd Panzer Division had crossed the
Somme River and reached the English Channel at Abbeville. The
German army had encircled approximately 1.7 million British, French,
Dutch, and Belgian soldiers in an enormous pocket 120 miles long and
72 miles wide.


Map Courtesy of: Department of History, United States Military
Academy

Northwest Europe: May 16-21, 1940 - Exploitation and Encirclement Phase