This fine success was due to the carefully detailed preparation carried out under the orders of General Herbert Plumer, to the destructive effect of the mines, to the violence and precision of the bombardment, to the excellent co-operation of the Air Forces, and to the harmonious working together of all arms. The tanks rendered excellent service.
THE BRITISH OFFENSIVE OF JUNE 7, 1917, AGAINST MESSINES RIDGE, PRECEDED BY THE FIRING OF NINETEEN ENORMOUS MINES
The Germans made an effort to rally, but their first counter-attacks, near Oosttaverne and to the east of Messines, failed.
At about 7 p.m., on June 8, a fresh German counter-attack was launched along the whole of the new front between St. Yvon and the Ypres-Comines Canal. Other engagements were fought to the east of Messines and near Klein Zillebeke. Although reinforced by fresh divisions, the German attack was broken by midnight.
Resuming their offensive, the British, on the morning of June 11, captured the whole system of German trenches, nearly a mile in length, situated near Poterie Farm, to the south-east of Messines. The next day fresh progress was made along nearly two miles of the front to the north-east of Messines, and the hamlet of Gapaard occupied.
THE FRONT LINE BEFORE THE ALLIES' OFFENSIVE OF JULY 31, 1917