This is called tactical reconnaissance. They give their
artillery commanders information as to where their projectiles are
falling.
During siege operations (as in Europe, where some trenches have remained
in about the same place for long periods) photographers go up in
airplanes each morning and photograph the enemy's trench lines. Blue
prints are made of these lines. By comparing these with the lines of the
previous day it is easy to determine the changes that have been made
during the night.
Other airplanes are detailed for the purpose of combat. They prevent
opposing airplanes from gathering information.
THE BIG IDEAS OF MARCHES
For marches to be entirely successful three conditions must be
fulfilled: (1) the troops must get there; (2) they must get there on
time; (3) and they must get there in good condition.
Now suppose that you were ordered to conduct the march of a company of
green men for a distance of 200 miles, just how would you solve the
problem?
Before starting, very careful preparations should be made.
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