CROSSING A BOMBARDED ZONE.
121.—Case I. Artillery opening fire to register.
A registering fire is easily recognized as the German artillery registers either with a single percussion shell at a time, or with two time-shells at three seconds interval.
In the German field gun, the setting of the angle of sight[E] and of the elevation[F] involves two operations.
122.—Oblique to right then to left.
Therefore infantry under registering fire should oblique forward rapidly.
123.—Case II: Artillery opening fire for effect.
The zone has necessarily been previously registered. Such a zone is easily recognized by the presence of shell holes.
124.—Avoid Zone if possible.
It should be avoided and the advance made on its outskirts.