The third and fourth parallels.
Telephone wires and material brought up.
Bridges for crossing the parallels.
2. Time of duration of the execution of the works.
This may vary from three to twelve days, or even more, depending upon circumstances.
3. Division of labor.
This depends upon the number of special working parties at your disposal. A whole division may be assigned for this work, but it is not the division that will make the attack.
4. Tools.
The tools required for this work are requisitioned from the headquarters of the attacking army.
5. Ammunition depots.