Why was the second battle of Ypres significance?

Related questions

1. How many Canadians died in Passchendaele?
2. How many died in the Battle of Passchendaele?
3. How did the battle of Passchendaele end?
4. How many New Zealand soldiers died in Passchendaele?
5. How many people fought in the Second Battle of Ypres?
6. How many Battle of Ypres were there?
7. How did the second battle of Ypres start?
8. What did the Battle of Passchendaele achieve?
9. What happened at the First Battle of Ypres?
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Tags

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