| 21. | The 262nd Reserve Regiment history writes that its trench system was " lost in a crater field ".
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| 22. | A trench system was built outside the camp in which the division practiced the techniques of trench warfare.
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| 23. | Consolidating the third-line proved difficult under relentless bombardment and determined opposition from the uncaptured right of the trench system.
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| 24. | The Germans recaptured the Hohenzollern trench system on 3 October, and the new attack was aimed at this point.
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| 25. | The front bunker of a trench system usually includes machine guns or mortars and forms a dominant shooting post.
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| 26. | Machine guns protected within casemates, on top in Tobruk pits, or in trench systems, some with thin overhead protection.
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| 27. | It is an active, initial back-arc rifting basin which has formed behind the Ryukyu arc-trench system in the West Pacific.
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| 28. | Work began on another defensive position in the autumn of 1917, with the original Hindenburg Line as its front-trench system.
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| 29. | Very early in the war, British defensive doctrine suggested a main trench system of three parallel lines, interconnected by communications trenches.
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| 30. | Under covering fire from his tank, Sgt Hurwitz and the two men with him cleared three buildings, and elaborate trench systems.
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