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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Aeroplanes and Dirigibles of War by Frederick A. Talbot: or zone comprises merely two or three successive stretches of
trenches and other defences, representing a belt five miles or so
in width, but this is a fallacy. The fighting zone is at least
20 miles in width; that is to say, the occupied territory in
which vital movements take place represents a distance of 20
miles from the foremost line of trenches to the extreme rear,
and then comes the secondary zone, which may be a further 10
miles or more in depth. Consequently the airman must fly at
least 30 miles in a bee-line to cover the transverse belt of the
enemy's field of operations. Upon the German and Russian sides
this zone is of far greater depth, ranging up to 50 miles or so
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