On the 17th February that move was made by three Divisions (Second, Eighteenth, and Sixty-third) before dawn, through heavy mist on the edge of a thaw, and in the face of a well-contrived barrage that caught the battalions forming up. But the positions and observation-points, already gained, helped our guns to help the infantry, broke up the enemy’s counter-attacks with satisfactory losses, and, in the next few days, gave us good command over the enemy’s artillery dispositions in the valley of the Upper Ancre and a fair look into his defences at Pys and Miraumont. Then the game stood thus: If Miraumont, which lay at our mercy, were taken, Serre would go; if Serre went, Puisieux-au-Mont and Gomiecourt, the pillar of the old German western defences, would be opened too; and it was no part of the German idea to cling to untenable positions, whose loss would have to be explained at home where people were asking why victory delayed so long. Not only was the whole of Arras-Le Transloy salient shaking by now; there was the prospect of indefinite wastage to no good end all along the rest of the Somme front, and though the weather, till then, had blunted the following weight of each following blow, many considerations pointed to a temporary withdrawal of a few miles in order to advance the more irresistibly at a more fitting time. Slowly, methodically then, with careful screens of veiled machine-guns behind them, and a series of scientifically chosen artillery positions, equally capable of supporting a counter-attack, or checking and destroying any too inconvenient body of pursuers, the enemy moved back into ground not yet churned and channelled by shell or traffic, over untouched roads which he had kept in perfect order, to this very end; and left us to follow through bottomless valleys of desolation. The frost broke on the third week of February, and the last state of the ground was worse even than it had been throughout the rainy autumn. Trenches caved in bodily; dumps sank where they were being piled; the dirt and the buttresses of overhead shelters flaked and fell away in lumps; duckboards went under by furlongs at a time; tanks were immobilised five feet deep and the very bellies of the field-guns gouged into the mud. Only our airmen could see anything beyond or outside the present extreme discomfort, but the mists that came punctually with the thaws helped to baffle even their eyes. On the 24th February the enemy had evacuated his positions in front of Pys, Miraumont, and Serre; next day his first system of defence, from Gueudecourt to west of Serre, running through half-a-dozen fortified villages, was in our hands. At the end of the month, Puisieux-au-Mont, with Gomiecourt and its defences, were occupied by us. The Germans had pulled themselves cleanly out of the worst of the salient.