What were tanks used for in ww1?

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Tags

1. #carry
2. #resist
3. #supplies
4. #flatten
5. #terrain
6. #capture
7. #heavy
8. #positions
9. #small
10. #designed
11. #developed
12. #fortified
13. #fortifications
14. #cross
15. #enemy
16. #trenches
17. #travel
18. #difficult
19. #vehicle
20. #original