A map of the trenches of World War I, in the area around Ypres. British trenches are marked in red and German trenches in blue. A note at the top states: Trenches corrected from information received up to 13 July 1918. The map is taken from Trench Maps [of the Battle Front in France and Belgium, showing trenches, wire entanglement, etc. With a Glossary printed on the back of the sheets].