The means of liaison are:
Telephone lines (for leadership in artillery. They are lengthened from the parallel of departure to the interior of the enemy’s position.)
Signal communication (established from the enemy’s position to a central point in the rear).
Rockets (precise signification of each kind laid down in orders).
Carried pigeons (headquarters that are to carry these laid down in orders).
Detachment of special runners (essential to be established between all units).
Aviation. During the advance, a particular system of liaison is established with the air service. Each division has at its disposal a certain number of accompanying planes that fly low and follow the assaulting battalions. Their duty is to establish communication between the leading elements of the advancing infantry, and the artillery, and the commanding general. The infantry signal to these airplanes by means of rockets and Bengal fires, and the planes in turn communicate with the artillery and the commanding general by means of wireless.
CHAPTER VII
TRENCH ORDERS
The following outline gives a synopsis of information required in various paragraphs for Battalion Orders in Trench Warfare, followed by models of each.
Six orders are given in these models, viz.: