Map of the Northwestern Front from March 21 to August 21, 1918. Despite the caption, the map shows primarily the German offensives against the British sector, Operations Michael and Georgette. From The War of the Nations Portfolio in Rotogravure Etchings. © Copyrighted 1919 by the New York Times Company
The above map shows the battleline when the German offensive of March 21, 1918 was launched, the furthest point reached in that advance, and the territory recovered up to August 21 by the Allies in Foch's counterattack of July 18.
Other views:
Larger