How did the second battle of Ypres end?

Related questions

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2. How many battles of Ypres were there?
3. Was the Gallipoli campaign successful?
4. How did the second battle of Ypres start?
5. What happened at Ypres during ww1?
6. Did Canada win the battle of Passchendaele?
7. How many people fought in the Second Battle of Ypres?
8. What happened in the 3rd Battle of Ypres?
9. How many New Zealand soldiers died in Passchendaele?
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Tags

1. #ended
2. #great
3. #began
4. #however
5. #world
6. #poison
7. #battle
8. #attack
9. #french
10. #insignificant
11. #weapons
12. #british
13. #gains
14. #after
15. #ypres
16. #german
17. #masks
18. #second
19. #developing
20. #significance
21. #introduction
22. #immediately
23. #germans
24. #would
25. #chemical
26. #their