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The closest thing I can think of which might answer this question is the trench periscope. It was like a pair of stationary binoculars, yet able to look above a trench like the periscope of a submarine. It was more like battlefield surveillance than spying.

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14y ago
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12y ago

Barbed wire and sandbags protected the men inside from enemy attacks. Also, if they were desperate, they would place bodies or "home-made" wooden stakes as spears to ward off the enemy.

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Q: What was used for spying during trench warfare in World War 1?
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