Belgium :
Description: Sheet 20SW. Edn. 3A. Area: north of Ypres - Yser from Loo - Zwartegat - Oostvleteren - Knockehoek - Steenstraat - Het Sas - Houthulst Forest - Bixschoote - Langemarck. Inundations in blue. German trenches in red; allied front line pecked blue. The situation just before the 3rd Battle of...
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