But the British had put on their curious-appearing headgear, and were waiting for the men whom they knew would be following the cloud at a safe distance. As soon as the Germans were near enough the British turned loose everything that would hurl a projectile large or small. By the time the gas cloud had cleared, or, to be more accurate, passed on to the rear of the British line and spent itself, the only Germans to be seen were in the piles of dead and wounded in front of the British most advanced trenches. The first time this occurred did not teach the Germans its lesson sufficiently well. A second time the Germans did not follow their gas cloud so closely. The gas-filled shells, however, the British found more difficult. They did not give warning of their coming as did the appearance of the comparatively slow-moving gas cloud. Thus in the first week of May, 1915, Hill 60 was taken by the Germans in a bombardment of asphyxiating shells. The bombardment had been immediately followed by a charge of bomb throwers who made an assault on the hill from three sides at once. That forced the British to retreat to a trench line at the foot of the hill, and gave the top of the hill to the Germans who immediately set up a lookout post for their artillery back of the Zandvoord ridge. This part of the British line was under the command of Sir Herbert Plumer. His troops occupied themselves from the first week in May to the middle of August, 1915, in fighting in the Hooge district. Most of this fighting was important only because it kept the Germans busy on that section of the line, and prevented them from being able to reenforce the Crown Prince of Bavaria or adding men to the force that was driving the Russians eastward. The men, fresh from the training camps, fought alongside of hardened veterans and learned much from them. From being what amounted to auxiliaries in these actions the new troops became hardened to actual fighting conditions. For this reason the personnel of the British troops on this part of the line was changed frequently. This was especially true at Hooge. Princess Patricia's Canadian Regiment occupied the Chateau and village of Hooge on May 8, 1915. The "Princess Pats," as they were known at home, turned over their quarters to the Ninth Lancers who were followed by the Fifteenth Hussars and the Second Camerons.