1ST GUARDS BRIGADE ORDER, NO. 77 _21st September 1916._ 1. 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. 2. (_a_) The Guards Division will form part of the attack of the Fourteenth Corps. (_b_) 1st Guards Brigade will attack on the right and 3rd Guards Brigade on left of Guards Division. (_c_) 18th Infantry Brigade of Sixth Division will be attacking on the right of 1st Guards Brigade. _Attacking Troops_―― 3. The attack of 1st Guards Brigade will be carried out by 2nd Bn. Grenadier Guards on the right and 1st Bn. Irish Guards on the left. The 2nd Bn. Coldstream Guards will be in support on the right and 3rd Bn. Coldstream Guards in support on the left. _Preliminary Bombardment_―― 4. A steady bombardment of hostile positions will begin at 7 A.M. on Y day and will be continued to 6.30 P.M. It will begin again at 6.30 A.M. on Z day. Night firing will be carried out nightly from 6.30 P.M. to 6.30 A.M. There will be no intensive fire previous to zero hour. _Forming-up Areas_―― 5. Forming-up areas, boundaries, and objectives are shown on the attached map. The first objective is marked Green. The second objective is marked Brown. The third objective is marked Blue. _Formation for Attack_―― 6. The 2nd Bn. Grenadier Guards and 1st Bn. Irish Guards will form up in two lines――one in the firing line and one in the support line. The 2nd Bn. Coldstream Guards will form up in the communication trench from T.8.a.9.4 to T.3.c.3.8. The 3rd Bn. Coldstream Guards will form up in the trench from T.8.a.9.4 to T.8.d.5.5. The 1st Guards Brigade Machine-gun Coy. will assemble with one section at the head of 2nd Bn. Coldstream Guards――one section in rear of 2nd Bn. Coldstream Guards and one section on right of 3rd Bn. Coldstream Guards. The 1st Guards Brigade Trench Mortar Battery will form up with two guns on right of front line and two guns on right of support line. The 75th Field R.E. and work platoons will form up in trenches T.8.d. 7. The infantry will advance to the attack of the Green line at zero――to the attack of the Brown line at zero + 1 hour. To the attack of the Blue line at zero + 2 hours. _Barrages_―― 8. (_a_) 50 per cent of Field Artillery barrage will be used for creeping barrage, and 50 per cent for stationary barrage. (_b_) In all cases the stationary barrage will lift back when the creeping barrage meets it. 9. (_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.