Early on August 23 the Thirty-seventh Division came up on the left and relieved the Naval Division. Guns had been pushed into position, so at 11 o'clock in the forenoon it was possible to deliver a strong attack under an adequate barrage upon the line of the railway. The result was a complete success, in spite of the formidable nature of the defences. The imperturbable English infantry flooded over every obstacle, took its inevitable losses with its usual good humour, and established itself upon the farther side of the position, while the tanks, taking advantage of a level crossing, burst through and did very great work. Both Achiet-le-Grand and Bihucourt fell to {124} the Thirty-seventh Division, while the Fifth captured the high ground overlooking Irles, and subsequently pushed on eastwards as far as Loupart Wood. Since Miraumont was still German the flank of Ponsonby's Division was scourged by the machine-guns, and an attempt by the Forty-second Division to relieve the pressure by taking the village had no success, but the Fifth maintained all its gains in spite of the heavy enfilading fire. In this fine operation the Thirty-seventh Division alone captured 1150 prisoners. There were signs, however, of German reaction, especially on the southern flank, where a new division, the Third Naval, had been brought into line. [Sidenote: August 23, 24.] August 24 was another day of victory. The New Zealanders passed through the depleted ranks of the Fifth Division and made good not only the whole of Loupart Wood, but also Grevillers to the north-east of it. An even more useful bit of work was the storming of Miraumont by the Forty-second Division in the south. This village, which had been nearly surrounded by the advance on the flanks, gave up 500 prisoners and several guns. The Forty-second continued its career of victory to Pys, which they took, and were only stopped eventually by the machine-guns at Warlencourt. This advance greatly relieved the situation on the right flank, which had been a cause for anxiety, and it also, by winning a way to the Ancre, solved the water problem, which had been a difficult one. This day of continued victorious advance was concluded by the occupation of Biefvillers by the united action of the Thirty-seventh and of the New Zealanders. [Sidenote: August 25, 26.]