From the Balloon Observer's Training Manual, WW1 cartoon

"All apparently natural features should be considered in relation to the general nature of the landscape, as the appearance of a hedge or even a solitary tree may be the cause of the discovery of a concealed battery."
Cartoon by Bernard Hugh (one of a series on the subject) should a hapless observer in a kite balloon looking at a tree on the ground through his binoculars only to find that it is in fact concealing a battery and a shell is heading straight towards him. A light-hearted view of the dangerous job done by kite balloonists

Balloonatics Balloonists Concealed Kite Observers Projectile Shells

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