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Around midday German troops broke through south-west of St. Quentin, reached the Battle Zone and by 14:30 were nearly 3 km (1.9 mi) south of Essigny. Gough kept in contact with the corps commanders by telephone until 15:00 then visited them in turn. At the III Corps Headquarters ("HQ"), he authorised a withdrawal behind the Crozat canal, at the XVIII Corps HQ he was briefed that the Battle Zone was intact and at the XIX Corps HQ found that the Forward Zone on each flank had been captured. Gough ordered that ground was to be held for as long as possible but that the left flank was to be withdrawn, to maintain touch with the VII Corps. The 50th Division was ordered forward as a reinforcement for the next day. On the VII Corps front, Ronssoy had been captured and the 39th Division was being brought forward; on the rest of the front, the 21st and 9th divisions were maintaining their positions and had preserved the link with V Corps of the Third Army in the Flesquières Salient to the north. The Fifth Army "Forward Zone", was the only area where the defences had been completed and had been captured. Most of the troops in the zone were taken prisoner by the Germans who moved up unseen in the fog; garrisons in the various keeps and redoubts had been surrounded. Many parties inflicted heavy losses on the Germans, despite attacks on their trenches with flame throwers. Some surrounded units surrendered once cut off, after running out of ammunition and having had many casualties; others fought to the last man.
German A7V tank in Roye, Somme, 26 March 1918
In the Third Army area, German troops broke through during the morning, along the Cambrai–Bapaume road in the Boursies–Louverval area and through the weak defences of the 59th Division near Bullecourt. By the close of the day, the Germans had broken through the British Forward Zone and entered the Battle Zone on most of the attack front and had advanced through the Battle Zone, on the right flank of the Fifth Army, from Tergnier on the Oise river to Seraucourt-le-Grand. South-west of St. Quentin in the 36th Division area, the 9th Irish Fusiliers war diary record noted that there had been many casualties, three battalions of the Forward Zone had been lost and three battalions in the Battle Zone were reduced to 250 men each, leaving only the three reserve battalions relatively intact.