What battle is in They shall not grow old?

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Tags

1. #wounded
2. #hundred
3. #first
4. #conflicts
5. #lives
6. #shall
7. #jackson
8. #grandfather
9. #western
10. #german
11. #machine
12. #paternal
13. #fought
14. #front
15. #years
16. #somme
17. #gunner
18. #commemoration
19. #those
20. #battle
21. #bloody
22. #fitting