Why did John McCrae wrote In Flanders Fields?

Related questions

1. How many Canadian soldiers are buried in Flanders Field?
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3. Are poppies poisonous?
4. Should I cut back poppies after flowering?
5. What does the white poppy Symbolise?
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7. Was there a battle in Flanders Field?
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5. #because
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18. #never
19. #flanders
20. #draft
21. #written