That Sunday evening it was decided to make another attempt against the north-west corner. The attempt was made shortly before dawn on Monday, the 17th July, but failed. All that morning there was no change in the situation; but on the morning of Tuesday, the 18th, an attempt was made to the eastward. The Germans, however, in a counter-attack, managed to penetrate far into the southern half of the wood. The troops in Longueval had also suffered misfortunes, with the result that the enemy entered the wood on the exposed South African left. [Illustration: Battle of the Somme.—Longueval and Delville Wood.] At 2.30 that afternoon the position was very serious. Lieutenant-Colonel Thackeray, of the 3rd South African Regiment, now commanding in the wood, held no more than the south-west corner. In the other parts the garrisons had been utterly destroyed. The trenches were filled with wounded whom it was impossible to move, since most of the stretcher-bearers had themselves been killed or wounded. That evening came the welcome news that the South Africans would be relieved at night by another brigade. But relief under such conditions was a slow and difficult business. By midnight the work had been partially carried out, and portions of the 3rd and 4th South African regiments had been withdrawn. But as at Flodden, when "they left the darkening heath More desperate grew the strife of death." The enemy had brought up a new division, and made repeated attacks against the South African line. For two days and two nights the little remnant under Thackeray still clung to the south-west corner of the wood against impossible odds, and did not break. The German method of assault was to push forward bombers and snipers, and then to advance in mass formation from the north, north-east, and north-west simultaneously. Three attacks on the night of Tuesday, the 18th, were repelled with heavy losses to the enemy; but in the last of them the South Africans were assaulted on three sides. All through Wednesday, the 19th, the gallant handful suffered incessant shelling and sniping, the latter now from very close. It was the same on Thursday, the 20th; but still relief tarried. At last, at 6 o’clock that evening, troops of a fresh division were able to take over what was left to us of Longueval and the little segment of Delville Wood. Thackeray marched out with two officers, both wounded, and 140 other ranks, gathered from all the regiments of the South African Brigade.