It is not necessary that the shelter accommodations be numerous, especially in the first line, because the assaulting troops are brought in only a few days before the attack.
The Execution of the Works. The second part of the plan of ground disposition contains the details of the execution of the works for the preparation of the ground previous to the attack. This part consists of;
1. Emergency works (necessary to the assault).
Observatories and command posts.
The first two parallels of departure for each battalion. If none need be constructed, the defensive lines used for this purpose are designated.
Secondary boyaux between parallels, one for each company.
Entrance and evacuation boyaux.
Ammunition depots and water points.
Dressing stations.
If there is more time, the following are constructed: