The British resumed the offensive in the morning of August 22, 1917, east and northeast of Ypres along the Ypres-Menin road, capturing a series of fortified farms and strong points in front of their positions and gaining in the advance a third of a mile of territory.
Further to the north the British carried forward their lines about half a mile over a front of two and a half miles. Owing to the fierce character of the fighting encountered in the forward push the number of prisoners taken was out of all proportion to the total losses inflicted on the enemy. Since the offensive began in the morning of August 15, 1917, the British had taken 1,378 men, including officers. In the same period they captured thirty-one machine guns and twenty-one trench mortars.
South and southwest of Lens the Canadians continued to fight hard and to make important gains. They succeeded in getting a firm grip on a stronghold only 300 yards south of the main railway station of the town. This was a huge slag pile which had been tunneled by the Germans and was known as "Green Crassier." The odd position constituted a barrier between the Canadians and the defenses of the city proper. It was connected by tunnels with dugouts and defenses underneath Lens, and the Germans, appreciating its value, clung to it tenaciously. Preceded by a heavy bombardment the Canadians attacked at early dawn and were atop of the Germans before the latter had any warning of what was impending. The long series of counterattacks in which they had been engaged during the previous days had not entirely quenched the German fighting spirit, and the slag pile was such a network of defenses that the Canadians were from the start roughly handled, but they held on with dogged determination, though they had never faced more formidable conditions, and despite the desperate efforts of the Germans to oust them. Surrounding the slag pile or "crassier" many of the ruined buildings had been transformed into strong and most ingeniously constructed fortifications. The Canadians systematically bombed their way through these defenses and drove out the defenders, who sought refuge in the numerous tunnels under the city. Lens was crowded with German troops of the Fourth Guards Division and the First Guards Reserve. Forced to live among the dead and wounded in underground caves, their lot was hideous beyond description.
French troops operating in the Verdun sector gained an important victory on August 24, 1917. In the early morning they began a powerful offensive on the left bank of the Meuse between Avocourt Wood and Dead Man Hill. By a single charge they carried Hill 304 and Camard Wood to the west of it. All the German positions were captured and the defenders made prisoners. To make doubly secure their possession of Hill 304, the French pushed on beyond it for a distance of about a mile and a quarter. The loss of Hill 304 and Dead Man Hill, which commanded all the approaches and ravines as far as Douaumont, deprived the Germans of every observation point from which they could watch the operations of the French troops.
The Germans won some success against the British forces along the Ypres-Menin road on this date, while the Canadians were forced to retire from the crest of the "crassier," or slag-pile stronghold, and to take up positions adjoining it. The Germans had succeeded in bringing forward fresh troops against the Canadians, who were worn down but not discouraged by almost continuous fighting day and night. The enemy had the advantage of numberless underground retreats, tunnels, subterranean chambers, and a network of cellars connected by passages from which they could dash suddenly, and after striking a shrewd blow disappear mysteriously from sight. The Germans were in a precarious situation and showed a disposition to conserve their forces.
On the Verdun front the French continued their victorious progress, capturing north of Hill 304 three strongly fortified works near Bethincourt. Since the beginning of this offensive the French had taken over 8,000 prisoners. If they cherished any belief in the superiority of the Germans as fighters, they held it no longer. The German High Command had issued orders that every position must be held regardless of the cost, but except in isolated instances they had displayed no unusual fighting qualities, while the German officers often perpetrated amazing blunders.
The French renewed the offensive on August 25, 1917, when they delivered a smashing blow on the right bank of the Meuse in the Verdun sector, gaining two-thirds of a mile on a front of two and a half miles. This gave them possession of the Fosses and Beaumont Woods and brought them to the outskirts of Beaumont. Violent artillery fighting continued around Hill 304 during the day. The French continued the drive, pushing their advanced posts forward to the southern outskirts of the village of Bethincourt and Forges Brook. A violent counterattack made by the Germans from Wavrille Wood was caught by French artillery fire and driven back shattered and in disorder.
On the British front during the night of August 25, 1917, the Germans were driven out of a trench northeast of Guillemont Farm which they had captured earlier in the day. In the morning of August 26, 1917, British troops attacking east of Hargicourt on a front of over a mile won half a mile of ground, and carried by assault strong enemy positions at Cologne and Malakoff Farms. About the same hour of the morning when this advance was made the Germans under cover of a heavy bombardment attacked in the neighborhood of the Ypres-Menin road. In this assault flame projectors were freely used and they succeeded for a brief time in recovering positions in the northwest corner of Inverness Copse. Before they could organize their defenses the British rallied and in a hotly pressed counterattack drove them out and reestablished their positions.
The British did not undertake any infantry action on a large scale during the next few days, but their guns, which far outmatched the Germans', were not taking a rest. An eyewitness whose experience covered many battle fields said he had never seen so many guns great and small as on the wide stretch of country back of Ypres. For miles he walked through concentric lines of batteries and estimated that the British were able to fire a hundred shells to the Germans' one. It was probably with the hope of saving man power that the Germans now built concrete blockhouses in front-line positions capable of holding a score of men, while keeping their main forces far back for counterattacks. But notwithstanding their new methods of defense the Germans lost heavily, for the British guns in forward positions kept the enemy support lines under a constant and blasting fire.
Owing to the fine weather the German aviators were active. In the course of a number of aerial engagements the British brought down four German aeroplanes and drove three others out of control, losing two of their own machines.