Recent reports from German sources indicate that all of Germany and German-occupied countries
are divided into air districts numbered I, II, III, etc. Listening devices on the coast or
frontier detect the approach of enemy planes while they are still at a considerable distance
from any German air district. These listening devices, it is said, can detect the motor noise
of an enemy plane as far away as 175 miles. When the sound of the motor is picked up, those
districts toward which the planes are flying are alerted first. In this preliminary alarm, all
factory lights which are noticeable are extinguished, radio stations go off the air, and
the crews of antiaircraft guns prepare for action.
As the planes approach the coast or frontier, it becomes evident toward which district the
planes are flying. That district is then put in the second state of alarm, which means that
the sirens are sounded and everybody goes to the air-raid shelters. All factory lights--including
emergency lights--are extinguished, and everything is put into readiness by the antiaircraft
In the case of a typical example, it may be assumed that hostile planes are approaching air
district I (see accompanying map), which is then put in the second state of alarm, while all
districts bordering on No. I (districts II, VII, and VIII) are automatically put in the
first state of alarm.
As soon as the attacking planes enter district I, it is put in the third state of
alarm (Hoechstalarm, or maximum alarm), meaning "the enemy is attacking." The
antiaircraft guns begin to fire and pursuit planes take off.
At the same time, the bordering districts II, VII and VIII are automatically put in the
second state of alarm, and all districts bordering these (in this case, IX, X, XII, and III) are
automatically put in the first state of alarm.
If the attackers fly on toward the district II, that district is put in the third state
of alarm. As soon as the planes cross its border, all bordering districts, including
district I, are automatically put in the second state of alarm. If the planes continue
further inland, e.g., toward Berlin, all the districts in the line of flight, and over
which the planes have passed, remain in the first state of alarm until the planes have
entirely left Germany and German-occupied territory, and the attack can be considered