The capture of Dead Man Hill by the French troops was an especially notable achievement, for its system of underground defenses made it as nearly impregnable as human ingenuity could devise. That it could be captured in a single day was owing to the ceaseless activity of the French gunners, who had ravaged the stronghold with explosives so thoroughly that it seemed impossible that anything human could survive, however hidden underground. There were a hundred deserters to the French lines, and the Germans surrendered in squads with their noncommissioned officers. The whole garrison of Dead Man Tunnel, which included two battalion commanders, were also made prisoners. When it is considered that the Germans had 400 batteries in action back of their front lines during the two days' advance it will be understood that the French fighting man was heartened up and could look with confidence to the future. 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.