A preliminary survey having been made, the G.O.C. XXth Corps will report by wire to G.H.Q. on the condition of the wells and water supply generally in Beersheba and on any water supplies found west and north-west of that place. He will telegraph an estimate as soon as it can be made of the time required to place the Beersheba water supply in working order.
When the situation as regards water at Beersheba has become clear so that the movement of XXth Corps and Desert Mounted Corps against the left flank of the enemy's main position can be arranged, the G.O.C. XXIst Corps will be ordered to attack the enemy's defences south-west of Gaza in time for this operation to be carried out prior to the attack of XXth Corps on the Kauwukah line of works. The objective of XXIst Corps will be the defences of Gaza from Umbrella Hill inclusive to the sea about Sheikh Hasan.
Instructions in regard to the following have been issued separate to all corps:
Amount of corps artillery allotted.
Amount of ammunition put on corps charge prior to operations.
Amount of ammunition per gun that will be delivered daily
at respective railheads and the day of commencement.
Amount of transport allotted for forward supply from
railheads.
The general average for one day's firing has been calculated
on the following basis:
Field and mountain guns and mountain howitzers …150 rounds per gun. 4.5-inch howitzers….120 rounds per gun. 60-pounders and 6-inch howitzers. 90 rounds per gun. 8-inch howitzers and 6-inch Mark VII. 60 rounds per gun.
This average expenditure will only be possible in the XXIst Corps up to Zx16 day and for the Desert Mounted Corps and XXth Corps to Zx13. After these dates if the average has been expended the daily average will have to drop to the basis of 100 rounds per 18-pounder per day and other natures in proportion.