10 Astounding Facts That Can Change the Way You See the World

5. During the World War I, the German, French, and British troops used hollow trees to spy on their enemies.

10 Astounding Facts That Can Change the Way You See the World

First, the craftsmen made special sketches and took measurements of a tree that was growing near the enemy’s territory. Then, they made an exact copy of that tree. During the night, a team of engineers carried out the uprooting operation and replaced the tree with a fake one. A soldier was hiding right inside of it and could carefully observe the enemy’s movements.

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