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The mistaken bombardments of friendly troops ended late on 9 June, when the New Zealand, 16th (Irish) and 36th (Ulster) divisions were withdrawn into reserve and the normal corps organisation was restored; anticipated large German counter-attacks had not occurred. On 10 June, the attack down the Blauwepoortbeek began but met strong resistance from the fresh German 11th Division, brought in from Group Ypres. The 3rd Australian Division advanced 600 yards (550 m) either side the river Douve, consolidating their hold on a rise around Thatched Cottage, which secured the right flank of the new Messines position; early on 11 June, the Germans evacuated the Blauwepoortbeek sector. British observation from the Oosttaverne line proved to be poor, which led Plumer to order a further advance down the slope. On 14 June, the II Anzac Corps was to push forward on the right from Plugstreet Wood to Trois Tilleuls Farm and Hill 20 and another 1,000 yards (910 m) to the Gapaard spur and Ferme de la Croix. IX Corps was to take Joye Farm, the Wambeke hamlet and come level with the Australians at Delporte Farm; X Corps was to capture the Spoil Bank and the areas adjacent. The attack was forestalled by a German retirement on the night of 10/11 June and by 14 June, British advanced posts had been established without resistance.
Meticulously planned and well executed, the assault secured its objectives in fewer than twelve hours. The combination of tactics devised on the Somme and at Arras, the use of mines, artillery survey, creeping barrages, tanks, aircraft and small-unit fire-and-movement tactics, created a measure of surprise and allowed the attacking infantry to advance by infiltration when confronted by intact defences. Well-organised mopping-up parties prevented by-passed German troops from firing on advanced troops from behind. The British took 7,354 prisoners, 48 guns, 218 machine-guns and 60 trench mortars. The offensive secured the southern end of the Ypres salient in preparation for the British "Northern Operation". Laffert, commander of Gruppe Wijtschate, was sacked two days after the battle.
Haig had discussed the possibility of rapid exploitation of a victory at Messines with Plumer before the attack, arranging for II and VIII Corps to advance either side of Bellewaarde Lake, using some of the artillery from the Messines front, which Plumer considered would take three days to transfer. On 8 June, patrols on the II and VIII Corps fronts reported strong resistance, Haig urged Plumer to attack immediately and Plumer replied that it would still take three days to arrange. Haig transferred the two corps to the Fifth Army and that evening, gave instructions to Gough to plan the preliminary operation to capture the area around Stirling Castle. On 14 June, Gough announced that the operation would put his troops into a salient and that he wanted to take the area as part of the main offensive. On 13 June, German aircraft began daylight attacks on London and the south-east of England, leading to the diversion of British aircraft from the concentration of air forces for the "Northern Operation".
