For all the airman may know to the contrary, the
trenches may be completely empty, whereas, as a matter of fact,
they are throbbing with alert infantry, anxious for a struggle
with the enemy.
This is one instance where the dirigible is superior to the
aeroplane. The latter can only keep circling round and round
over the suspicious position; the movement through the air
interferes with close continuous observation. On the other hand,
the dirigible can maintain a stationary position aloft for hours
on end. Then the issue is resolved into a contest of patience,
with the advantage to the airman. The soldiers in the trenches
fret and fume under cover; confined concealment is irksome and is
a supreme test of the nerves. Unless the soldiers are made of
very stern stuff, physical endurance succumbs. Some rash act--
apparently very trivial--may be committed; it suffices for the
vigilant sentinel overhead. He detects the slender sign of life,
forms his own conclusions, and returns to his headquarters with
the intelligence that the enemy is playing "Brer Rabbit."
It has also become increasingly difficult for the airman to
gather absolutely trustworthy data concerning the disposition and
movement of troops.
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