The troops were now faced by a perfect warren of trenches and posts which were held with great gallantry by the Alpine Corps. There was no rest for the British, and the night of the 18/19th was spent by the same men who had been fighting all day in bombing up the trenches and endeavouring to enlarge their gains. The same sort of fighting, carried on by small groups of determined men led by subalterns or non-commissioned officers, and faced by other small groups equally determined, went on along the whole line during September 19 and 20. {69} In those two days the advance went steadily on, in spite of many a local rebuff and many a temporary check. On September 21 the battle was renewed still in the same fashion with heavy losses upon both sides. At one time the steady flow of the British tide turned for a time to an ebb, as a very strong German counter-attack came rolling into it, and swept it back along the whole front from the positions which it had overflowed in the morning. The Seventy-fourth was forced out of Quinnemont Farm, the Eighteenth out of Doleful Post, the Twelfth were checked at Bird Trench, while the Fifty-eighth, intermingled with men from the right wing of the Fifth Corps, could not get past Kildare Avenue. These fanciful names, unseen on any save a large-scale trench map, bulked large in this bloody battle, for they were master points which controlled the ground around. The sun set with the Germans in the ascendant, and the British clawing desperately at a series of posts and farms which they could just hold against very heavy pressure. One of the most severe engagements was that of the 10th Essex of the 53rd Brigade when they attempted the Knoll, a position from which the whole Hindenburg Line would have been exposed. It was said by experienced soldiers that more severe machine-gun fire had seldom been seen than on this occasion, and the tanks engaged were unable to use their own guns, so thick were the driving storms of bullets which beat upon their iron sides and searched every aperture. The Essex men lost heavily, and the Knoll was not taken. This and the other posts mentioned above were the cause of much trouble to the Americans on September 27. [Sidenote: Sept. 22.]