In the Favreruil, Sapignies, and Gomiecourt district, north of Bapaume, the advance was mainly accomplished through the pressure of fresh German forces upon the exhausted and attenuated line of the Forty-first Division, which still struggled bravely, and in the end successfully, against overwhelming odds. In the effort to hold a line the divisions which had been drawn out as too weak for service turned back once more into the fray like wounded men who totter forward to strike a feeble blow for their comrades in distress. The Sixth Division was led in once more, and sustained fresh and terrible losses. Its left fell back to Favreuil, exposing the right wing of the Fortieth Division. The Twenty-fifth Division to the east of Achiet found itself also once more overtaken by the battle. By evening the line had been built up again in this quarter, and the dead-weary British infantry snatched a few hours of sleep before another day of battle. The Nineteenth Division, reduced to 2000 rifles, lay from Le Barque to Avesnes, with the Second upon their right and the Forty-first upon their left, while the whole of this difficult retreat had been covered by the weary but indomitable Highlanders of the Fifty-first. The really serious situation was to the south of Bapaume upon the old Somme battle-field, where the Germans had made sudden and alarming progress. Their temporary success was due to the fact that the losses in the British lines had contracted the ranks until it was impossible to cover the whole space or to prevent the infiltration of the enemy between the units. The situation required some complete and {61} vigorous regrouping and reorganisation if complete disaster was to be avoided. Up to this point the British Higher Command had been unable to do much to help the two hard-pressed armies, save to supply them with the scanty succours which were immediately available. Now, however, it interfered with decision at the vital spot and in the vital moment. To ensure solidity and unity, Congreve's Seventh Corps, which had been the northern unit of the Fifth Army, became from this time onwards the southern unit of the Third Army, passing under the command of General Byng. With them went the First, Second, and Third Cavalry Divisions, which had been doing really splendid service in the south. Everything north of the Somme was now Third Army. At the same time the three fine and fresh Australian Divisions, the Third, Fourth, and Fifth, were assembling near Doullens in readiness to strike, while the Twelfth British Division was also hurried towards the place of danger. The future was dark and dangerous, but there were also solid grounds for hope. [Sidenote: Fourth and Fifth Corps. March 21.]