The division now came under order of XIX Corps, and became part of the corps hard pressed right flank. On 29 March it was deployed between the villages of Demuin and Mézières-en-Santerre, to the south east across the Roye-Amiens road. The 59th Brigade, now reduced to 770 men, held the south of the line and 61st Brigade composite battalion the north, 60th Brigade was in reserve. The 92nd Artillery Brigade rejoined the division. The Germans attacked at mid-day and forced the south flank, reinforcements from the much depleted 149th Brigade of 50th (Northumbrian) Division were received (1/4th, 1/5th and 1/6th Northumberland Fusiliers, themselves needing reinforcement from the 4th East Yorkshire Regiment, 5th D.L.I. and the 22nd Entrenching Battalion, of the 50th Division), the 60th Brigade was brought out of reserve, and the division was ordered to recapture Mézières, from which the French had been driven. The 60th Brigade attacked at 16:00 hrs and although men from the three weakened battalions involved (12th K.R.R.C., 12 R.B. and 11th D.L.I., the last only 140 strong) succeeded in reaching the far side of the village, a simultaneous attack by the Germans on Villers-aux-Érables ( to the east) left them with an open flank and they were forced to retire despite taking 50 prisoners and destroying a battery of German trench mortars. A counter-attack by the 149th Brigade restored the southern flank.