It was, however, to the south, where the Third and Fifth Armies were intermittently joined and vaguely interlocked, that the danger chiefly lay. About noon, the enemy, finding the weak spot between the two armies, had forced his way into Sailly Saillisel in considerable force, and pushed rapidly north and west from the village. So rapid was the German advance upon the right rear of the Fifth Corps that Rancourt and even Combles were said to have fallen. In vain the Seventeenth Division overstretched its wing to the south, trying to link up with the Seventh Corps. Early in the afternoon Morval and Les Bœufs had gone, and the troops were back upon the mud-and-blood areas of 1916. For the moment it seemed that the British line had gone, and it was hard to say what limit might be put to this very serious advance. By midnight the enemy were north of Bapaume, and had reached Ervillers, while in the south they had taken Longueval, the key village of Delville Wood. It was indeed a sad relapse to see all that the glorious dead had bought with their hearts' blood reverting so swiftly to the enemy. In the north, however, as has already been shown in the story of the Sixth Corps, the enemy's bolt was shot, and in the south his swift career was soon to be slowed and held.

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 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.

Fourth and Fifth Corps. March 21.

On the morning of March 25 the line of the Third Army, which had defined itself more clearly during the night, ran from Curlu near the Somme, east of Bazentin, west of Longueval, east of Martinpuich, through Ligny Thilloy, Sapignies, Ervillers, and hence as before. The enemy, whose cavalry were well up and in force, at once began his thrusting tactics in the southern section of the field, and may have expected, after his advance of the day before, to find some signs of weakening resistance. In this he was disappointed, for both the 47th Londoners in front of Contalmaison and the Second Division at Ligny Thilloy beat off several attacks with very great loss to the assailants. The units were much broken and mixed, but the spirit of the individuals was excellent. The pressure continued, however, to be very great, and in the afternoon the line was once more pushed to the westwards. There was severe fighting between Bapaume and Sapignies, where mixed and disorganised units still held the Germans back, but in the late afternoon three distinct gaps had appeared in the line, one between the Seventh and Fifth Corps, one in the Fifth Corps itself in the Pozières area of the Sixty-third Division, and one between the Fifth and the Fourth Corps. Fortunately, the resistance had been so desperate that by the time the Germans had their opportunity they were always so bedraggled themselves that they could not take full advantage of it. The general order of divisions in this area, counting from the south of Contalmaison, was Seventeenth, Forty-seventh, Sixty-third, Second, upon the morning of March 25.

The Seventh Corps, the previous adventures of which will be described under the heading of the Fifth Army, had now become the right wing of the Third Army. It had been strengthened by the advent of the Thirty-fifth Division, and this unit now covered from west of Curlu to east of Maricourt, where it touched the right of the Ninth Division—if the thin ranks of that gallant band can be dignified by so imposing a title. The Highlanders covered the front to Montauban, where they touched the First Cavalry Division, but beyond that the enemy were pouring round their flank at Bernafoy and Mametz Woods. It was under these trying conditions that the Twelfth Division was ordered up, about noon, to secure the left of the Seventh Corps and entirely stopped the dangerous gap.

Another had formed farther north. The Seventeenth Division, who were on the right of the Fifth Corps, held from Mametz to Contalmaison. Thence to Pozières was held by the Forty-seventh. A gap existed, however, upon their left, between them and the Sixty-third Division, who were gradually falling back upon Courcelette. The left of the Naval Division was also in the air, having lost touch with the right of the Second Division who were covering Le Sars. North of them the Nineteenth Division extended from the west of Grevillers to the south of Bihucourt. The 57th Brigade in the north, under the local command of Colonel Sole, fought a fine rearguard action as the enemy tried to debouch from Grevillers. Considering how terribly mauled this brigade had been a few days before, this was a really splendid performance of these brave Midlanders, and was repeated by them more than once during the day. From their left flank to the north stretched a new division, Braithwaite's Sixty-second, which had upheld the honour of Yorkshire so gloriously at Cambrai. Their line ran west of Sapignies and joined the Forty-second Division at the point where they touched the Sixth Corps, east of Ervillers.

The front of the Sixty-second stretched from Bucquoy to Puisieux. The enemy kept working round the right flank, and the situation there was very dangerous, for everything to the immediate south was in a state of flux, shreds and patches of units endeavouring to cover a considerable stretch of all-important country. South of Puisieux there was a gap of four or five miles before one came to British troops. Into this gap in the very nick of time came first the 4th Brigade of the Second Australian Division, and later the New Zealand Division in driblets, which gradually spanned the vacant space. It was a very close call for a break through without opposition. Being disappointed in this the Germans upon March 26 spent the whole afternoon in fierce attacks upon the Sixty-second Division, but got little but hard knocks from Braithwaite's Yorkshiremen. The 186th Brigade on the right threw back a flank to Rossignol Wood to cover the weak side.

Meanwhile the enemy had made a spirited attempt to push through between the Seventh Corps and the Fifth. With this design he attacked heavily, bending back the thin line of the Ninth Division, who were supported by the Twenty-first Division, numbering at this period 1500 men. At four in the afternoon the German stormers got into Maricourt, but they were thrust out again by the Thirty-fifth Division. They had better success farther north, where in the late evening they got round the left flank of the Forty-seventh Division and occupied Pozières. The Londoners threw out a defensive line to the north and awaited events, but the general position between the Fifth and Fourth Corps was serious, as the tendency was for the gap to increase, and for the Fourth Corps to swing north-west while the other turned to the south-west. The Twelfth Division was transferred therefore from the Seventh to the Fifth Corps, and was given a line on the west bank of the Ancre from Albert to Hamel. This move proved in the sequel to be a most effective one. In the evening of this day, March 25, the line from Bray to Albert exclusive was allotted to the Seventh Corps, which was directed to leave a covering party as long as possible on a line from the River Somme to Montauban, in order to safeguard the retirement of the Fifth Army. Then came the Twelfth Division covering Albert, then the remains of the Forty-seventh and of the Second from Thiepval to Beaumont Hamel, all moving across the Ancre. It is said that during the retreat from Moscow an officer having asked who were the occupants of a certain sledge, was answered: "The Royal Regiment of Dutch Guards." It is in a somewhat similar sense that all mentions of battalions, brigades, and divisions must be taken at this stage of the battle. The right of the Fourth Corps was threatened by an irruption of the enemy at Pys and Irles, who threatened to get by this route round the flank of the Sixty-second Division, but found the Twenty-fifth Division still had vitality enough left to form a defensive flank looking south. At the same time the Forty-second Division had been driven back west of Gomiecourt, and was out of touch with the right of the Sixth Corps. Things were still serious and the future dark. Where was the retreat to be stayed? Was it destined to roll back to Amiens or possibly to Abbeville beyond it? The sky had clouded, the days were mirk, the hanging Madonna had fallen from the cathedral of Albert, the troops were worn to shadows. The twilight of the gods seemed to have come.

It was at that very moment that the first light of victory began to dawn. It is true that the old worn divisions could hardly be said any longer to exist, but the new forces, the Yorkshiremen of the Sixty-second in the north, the New Zealanders and the Twelfth in the centre, and very particularly the three splendid divisions of Australians in the area just south of Albert, were the strong buttresses of the dam which at last held up that raging tide. Never should our British Imperial troops forget the debt which they owed to Australia at that supreme hour of destiny. The very sight of those lithe, rakish dare-devils with their reckless, aggressive bearing, or their staider fresh-faced brethren with the red facings of New Zealand, was good for tired eyes. There was much still to be done before an equilibrium should be reached, but the rough outline of the permanent positions had even now, in those hours of darkness and danger, been traced across the German path. There was but one gap on the morning of March 26, which lay between Auchonvillers and Hebuterne, and into this the New Zealand Division and one brigade of the Second Australians were, as already stated, hurriedly sent, the New Zealanders supporting and eventually relieving the Second British Division, while the Australians relieved the Nineteenth. The line was attacked, but stood firm, and the New Zealanders actually recaptured Colincamps.