| 31. | They dread being caught in the trench warfare of politics.
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| 32. | Trench warfare becomes ubiquitous as each side digs in for protection from machine guns.
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| 33. | Trench warfare meant there was little scope for cavalry operations.
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| 34. | Explosions at a former Trench Warfare Explosives Act of 1875.
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| 35. | "This is trench warfare for both sides, " he said.
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| 36. | In 1917 he became Assistant Director of Trench Warfare with the rank of Colonel.
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| 37. | The future need not be characterized by more trench warfare.
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| 38. | Introduced by German forces in 1915, they quickly became a fixture of trench warfare.
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| 39. | This was followed by trench warfare in Flanders and Artois.
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| 40. | The revolution is over and it's settled into trench warfare.
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