Answer: YSER

AnswerCrossword Clue
YSERRiver in France and Belgium
YSERStrategic WWI river
YSERNieuwpoort river
YSERStrategic Belgian river of WWI
YSERRiver through France and Belgium
YSERImportant river in WWI
YSERNieuwpoort's river
YSERRiver in western Belgium
YSERStrategic river of 1914
YSERBelgian border river
YSERRiver of France and Belgium
YSERRiver through Belgium
YSERRiver in NW Belgium
YSERRiver near Dunkirk
YSERFlanders stream
YSER1914 battle site
YSERFlanders flower
YSERRiver of Belgium's West Flanders
YSERFrench-Belgian river
YSERRiver with a canal to Ypres
YSERRiver flooded in W.W. I to thwart the Germans
YSERFrench waterway
YSERFlanders' River
YSERFrance-Belgium river
YSERRiver of Flanders
YSERRiver to the North Sea
YSERBelgian river
YSERFlanders river
YSERNorth Sea flower
YSERRiver in Flanders
YSERFeeder to the North Sea
YSERNorth Sea feeder
YSERMinor waterway, flowing to the North Sea
YSERRiver in Belgium
YSERNorth Sea tributary
YSERFrench-Belgian river
YSERRiver of Belgium
YSERFlower of Flanders
YSEREarly WWI battle site
YSEROctober 1914 battle site