All runners and signallers should know the position of the advanced Brigade Report Centre, and that the best means of approach to it will probably be down the communication trench T.3.c and T.8.b. Finally, it cannot be too much impressed on assaulting troops the necessity for clinging to our own barrage. It will be an attack in which this should be comparatively easy and on which the success of the whole operation may depend. M. B. SMITH, Captain, Brigade-Major, 1st Guards Brigade. _September 22, 1916._ The Operation Order by Lieut.-Colonel de Crespigny, Commanding 2nd Battalion Grenadier Guards, was as follows: 22/9/16. _Map Ref. 57.c.S.W._ 1. _Intention._――The Fourth Army will renew the attack on Z day in combination with the attacks by the French to the south and Reserve Army to the north. 1st Guards Brigade will attack on the right of the Division. 3rd Guards Brigade will attack on our left. 18th Infantry Brigade will attack on our right. 2. This Battalion will be on the right of the 1st Guards Brigade. 1st Bn. Irish Guards will be on the left. 2nd Bn. Coldstream Guards will be in support on the right. 3rd Bn. Coldstream Guards will be in support on the left. 3. _Formation of Attack._――The Battalion will form up in two lines, one in the firing line and one in the support line, care being taken that bayonets do not show on the top of the trenches before zero. _Front Line._――No. 1 Coy. on left, No. 2 Coy. on the right. _Support Line._――No. 3 Coy. on left, No. 4 Coy. on the right. Forming-up areas, boundaries, and objective as shown on map at Headquarters, to be copied in. 4. First objective is marked Green. Second objective Brown. Third objective Blue. 5. _Task._――To press the attack through to the Blue line, a sufficient flow of troops being maintained to ensure that the Brown line is strong and well supported. 6. (_a_) At zero the creeping barrage will start 100 yards in front of our front-line trenches. It will advance at the rate of 50 yards a minute until it is 200 yards beyond the Green line, when it will become stationary. At zero Nos. 1 and 2 Coys. will advance to the attack of the Green line, followed at 75 yards’ distance by Nos. 3 and 4 Coys., who will not stop at our old front line but will push on into the Green line. On reaching the Green line companies will at once reorganise.