SECRET.
4th Divisional Artillery. Order No. 81.
Reference Trench Map corrected to 28/7/17.
23rd Bde. .R.F.A.
29th Bde. R.F.A.
32nd Bde. R.F.A.
17th Div. Arty.
4th Div G. )
12th Div. Arty. )
R.A. XVII Corps ) For information.
H.A. XVII Corps )
O——-O——–O
1. On august 8th a continuous bombardment of trenches is taking place on the front of the 12th Division and part of the 4th Division front.
Throughout the day vigorous counter-battery work will be carried out. At Zero hour strong patrols will be sent out to obtain identifications, and capture or kill any survivors from the bombardment.
2. The operation will be divided into 3 phases:-
PHASE I:-Bombardment of front system with 6” Hows, 4.5” Hows and Trench Mortars.
PHASE II:- Lifting and replacement of 6” Hows by lighter guns to enable our Infantry to reach their forming up positions.
PHASE III – Period during which our patrols will enter the enemy trenches under a creeping Barrage and will remain under a protective Barrage.
12th Inf. Brig will send patrols into DEVILS Trench 150 yards North and South of BIT Lane from Zero hour until Zero plus 45 mins.
3. Programme of artillery bombardment attached.
4. O.P’s will be engaged as follows:-
I.27.d.10.40 125 Bty 1 gun ½ round per min. 50% H.E. & Shrapnel
throughout the operation.
I.32.d.95.05. 127Bty 1 gun ) ½ round per gun per min.
)50% H.E. & Shrapnel throughout the operation to Zero hour.
O.3.a.20.72. 127 Bty 1gun ) At Zero hour these guns will join in the Barrage
but will pay particular attention to the O.P’s during the protective Barrage.
5. During PHASE III 1/3 18 pdrs. 23rd and 32nd Brigs will be so disposed that they can be taken out of the Barrage for counter-attacks or fleeting opportunities without leaving a gap.
6. 4 – 18 pdrs and 2 – 4.5” Hows per 23rd and 32nd Brigs will be selected to respond to NF, LL or Zone Calls. 10 rounds shrapnel per 18 pdr and 5 rounds per 4.5” How (with 106 Fuze) will be fired on all calls within range.
Dividing Line of responsibility for GF and Zone Calls:-
Field Artillery West of the Central Grid Line joining the centres of squares O.16, O.10., O.4. and thence the existing boundary (grid line dividing squares I.33. – I.34) Northwards.
7. Tasks have been made out for the full number of guns and Hows available, except where specially mentioned.
Brigade Commanders will make their own arrangements for resting guns and detachments without diminishing the fire.
8. Registration will be as inconspicuous as possible.
9. Liaison Officers will be detailed as follows from 7 a.m. – 10 p.m. 8th August:-
(a) An Officer not below the rank of Major from 32nd Brig for 12th Inf. Brig H.Q.
(b) An Officer not below the rank of Captain from 23rd Brig will be at H.Q. Right Battalion 12th Inf. Brig.
10. All Batteries will return to their normal tasks at 9 p.m.
11. Watches will be synchronized to this H.Q. at 9 p.m. Aug. 7th. 9.30 a.m. and 6 p.m. August 8th.
12. Zero hour 7.45 p.m.
13. Acknowledge.
CCS**** Major
Brigade Major 4th Divisional Artillery
6/August/1917.
T.M.
O.2.b.94.68.
O.3.a.00.62.
I.33.c.10.20.
Sack wood.
18 prs ease fire 10” before Zero.