Why was Ypres important in ww1?

Related questions

1. Did John McCrae survive the war?
2. Is there a real Flanders Field?
3. Why do poppies grow on battlefields?
4. Who is buried in Flanders Field?
5. Where are ww1 German soldiers buried?
6. How many Canadians died in Flanders Fields?
7. Where is Ypres France?
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Tags

1. #sector
2. #coastal
3. #important
4. #french
5. #blocking
6. #ports
7. #wipers
8. #german
9. #landmark
10. #route
11. #imperial
12. #front
13. #through
14. #defence
15. #strategic
16. #western
17. #british
18. #ypres