The materials in this series include topographical maps depicting parts of Europe during World War I. Subjects include the French army, the British front, the German army's order of battle, and maps of famous World War I battlefields. Famous World War I battlefields include the South Picardy front, which was part of the "Race to the Sea" where French and German armies moved towards the North Sea in several different flanking maneuvers. Another famous battle site found in this series is the map of the Flanders sector. The Flanders sector included the village of Ypres which, while strategically unimportant, hosted battles for almost the entire duration of the war and was the site of fierce trench warfare.