The orders to each corps commander were given in the form of general indications, the details being left to his own judgment, for the position of each corps and the pressure upon it formed a number of independent problems. We shall turn to the north therefore, where, upon the whole, the situation was least critical, and we shall follow first the Seventh and then the Nineteenth Corps in their various movements until a condition of equilibrium was at last safely established. Let it be at once stated that the design was duly carried out along the whole line, and that the operation, which at the time was designated as a disaster, was really a remarkable example of how by the coolness of commanders and the discipline of their men, the most desperate situation may be saved and the most powerful and aggressive foe foiled in his attempts. What complicated the military problem of the Fifth Army was that the {116} German threat was really aimed at Paris as much as at Amiens, and that if they could have got through at Essigny and cut off the Fifty-eighth Division there were hardly any reserves between them and the all-important metropolis. [Sidenote: Seventh Corps. March 22.] The morning of March 22 again presented those conditions of fog and low visibility which are favourable to the attack. There was no advance in the early hours upon the new positions of the Ninth Division, but the enemy directed his attention entirely to the Chapel Hill front of the Twenty-first Division upon the right, which was still held by the Lincolns. An attempt was made to relieve them by the Scots battalion of the South Africans, who took over some of the northern line. The defence was a splendid one, but by 4 o'clock in the afternoon the Germans had gained most of this high ground by outflanking it, and the South Africans at Revelon Farm, who had been reinforced by the 11th Royal Scots Battalion from the 27th Brigade, were badly enfiladed in consequence by rifle and machine-gun fire from the south. Colonel M'Leod of the South African Scots, and many officers and men, were among the casualties. There was a withdrawal therefore of the right of the Ninth Division, and about 6.30 P.M. the Germans had got as far as Heudicourt, and the brigade staff at Sorel had to line up in order to resist his turning movement to the north. So far round had the Germans penetrated that the Africans were compelled to fall back due north for some distance until their rear was clear, when they retreated with the rest of the division westwards towards Nurlu. By two in the morning of March 23 the new positions had been reached, and the attenuated {117} South African Brigade, which had borne the brunt of the fighting, was taken into divisional reserve. This difficult retreat was rendered possible by the desperate resistance offered by the 6th Scots Borderers, who formed a defensive flank south of Sorel and gave the troops to the north time to gain the new position.