Why was the 2nd Battle of Ypres important?

Related questions

1. What does Ypres mean in English?
2. Why did the 2nd Battle of Ypres happen?
3. Why is Ypres now called Ieper?
4. How did the battle of Ypres end?
5. Was Ypres damaged in ww2?
6. Is Ypres French speaking?
7. Who won in the third battle of Ypres?
8. When did Ypres end?
9. Was gas used at Passchendaele?
10. How many died in the Battle of Ypres?

Tags

1. #second
2. #failed
3. #april
4. #ieper
5. #poison
6. #ypres
7. #although
8. #marked
9. #western
10. #costly
11. #flanders
12. #battle
13. #battles
14. #three
15. #first
16. #world
17. #exploit
18. #allied
19. #advantage
20. #opened
21. #weapon
22. #germans
23. #attack