22nd Corps ‘G’ 17 July 1918

22nd Corps ‘G’

1. It would appear that the Corps may shortly be engaged in operations of the nature of open warfare.
2. The following scheme is submitted for approval for more efficient aerial co-operation than has formerly been possible.
3. The system does not entail the use of any apparatus beyond the Popham panneau and ground strips already provided.
4. It is anticipated that should the scheme be adopted and the units on the ground be able to carry out their part. The Squadron would have no difficulty whatever in (a) keeping Corps informed of exact positions of units down to Brigades, and dropping messages to these formations; (b) in receiving messages from formations for transmission to Corps (thence to Divisions if required).
5. The scheme is easily capable of elaboration to include units down to Battalions, but it is considered that owing to the very short notice which it will be possible to give, it would probably be inadvisable to attempt to deal with smaller formations than Brigades.


1. Corps dropping station indicated in any suitable ****** – say “XII”
2. Divisional H.Q. to be indicated by Popham panneau with one of the letters W X Y or Z placed at 9 o’clock to the panneau. Divisional calls would thus simply W X Y or Z.
3. Brigade H.Q. will be indicated by popham panneau together with a call letter placed opposite one of the four corners “W X Y or Z” position. Calls of Brigades of W Division to be WW WX WY WZ and for ‘X’ Division XW XX XY XZ and so on.

1. A unit seeing a contact ‘plane in its neighbourhood and wishing to report its position, will merely expose its popham panneau and call letter in an approximate position. Machine will acknowledge, for example “XWRT”. If the unit wishes to communicate with a machine, it will open popham panneau in the normal manner and procedure will be as usual.
2. Corps wishing to communicate with a unit will forward message to Squadron giving as far as possible approximate location. The ‘plane will fly in direction of unit required sounding call letter on klaxon. Unit will expose panneau and call letters and machine will drop message.
3. In the event of a unit losing its popham panneau, or the situation preventing its being exposed, the call letter in ground strips will be sufficient indication.
4. In extreme cases when neither panneau nor strips can be exposed, it is suggested that units should fire four Very’s lights in rapid succession as a signal that it is the unit to which the plane is calling.


1. The procedure above outlined presents no difficulty whatever from the air point of view at least and will enable higher command (a) to locate its units at any time; (b) to communicate with the unit; (c) to receive messages from the unit.
2. Code calls are reduced to one or two letters only which are all made with straight ground strips.
3. The scheme is systematic in that units belonging to the same formation have the same initial letter in their call.
4. In the event of a particular unit being undiscoverable there should be little difficulty in locating a neighbouring unit and communicating with it instead.
5. Owing to the message having no “addressed to” but only a call letter address, little information is given to the enemy should they fall into wrong hands.
“Addressed to” will not be required. Normally all messages received from the ground will be dropped at Corps. “Addressed from” not required; call letters give sufficient indication.

J.M. S***
Commanding, No 82 Squadron,
Royal Air Force.
In the Field.
17th July 1918.

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