(b) To make a defensive flank, if the attack on our flanks is held up.
(c) To support the attack of the leading Guards Brigades, if held up anywhere.
13. 76th Field Company, R.E., will be in Brigade Reserve. It will be formed up in a place to be notified later, and will await orders from the Brigade.
14. Ninth Squadron, R.F.C., will have two contact aeroplanes in the air from zero to dark on Z day, and again from 6.30 A.M. to 9 A.M. on Z + 1 day.
Flares will be lit as follows:
(i.) On obtaining each objective.
(ii.) At 12 noon and 5 P.M. on Z day.
(iii.) At 6.30 A.M. on Z + 1 day.
Red flares will be used by infantry, Green flares by cavalry.
15. All transport will be packed up and ready to move forward at 1 hour’s notice after zero + 4 hours.