Wellington, however, ordered a second battery to be constructed, somewhat to the left rear of the first (No. 4 in the map), and behind instead of before the parallel. The position chosen was one on to which many of the French guns could not be trained, while it was equally good with battery No. 3 for playing on the outer _enceinte_. After midnight [October 1-2] the two disabled and one intact 18-pounders were dragged out of the abandoned battery and taken to the rear. Next morning, however, a new disappointment was in store for Wellington: the French detected battery No. 4, and opened upon it, with all guns that could reach it, such an accurate and effective fire that the parapet, though revetted with wool-packs, soon began to crumble, and the workmen had to withdraw. ‘It became evident that under such a plunging fire no guns could ever be served there[41].’ All hopes of breaching the lower _enceinte_ from any point on its immediate front had to be abandoned--and meanwhile the heavy artillery had been ruined. The next order issued was that the solitary intact 18-pounder and the other gun with the split lip--which had been mounted on a new carriage--should be hauled back to the hill of San Miguel and put into their original place, battery No. 1. The night during which they were to be removed was one of torrential rain, and the working parties charged with the duty gradually dropped aside and sought shelter, with the exception of those detailed from the Guards’ brigade and the artillery. At dawn on October 3 the guns had not reached their destination, and had to be shunted beside the salient of the hornwork, to hide them from the enemy during the day. Wellington, justly vexed with the shirking, ordered the defaulters to be put on for extra duty, and the names of their officers to be formally noted. This day was lost for all work except that of the mine, which advanced steadily but slowly, long intervals of rest having to be given in order to allow for the evaporation of foul air in its inner depths (October 3). On the following night, however, the 18-pounders were got into battery No. 1, and about the same time the engineer officers reported that the mine (now eighty-three feet long) had got well under the wall of the outer _enceinte_. The 4th of October was therefore destined to be an eventful day. At dawn, battery No. 1 opened on the wall, where it had been damaged by the first mine on September 29th, using the two 18-pounders and three howitzers. The effect was much better than could have been expected: the 18 lb. round-shot (of which about 350 were used) had good penetrating power, and the already shaken wall crumbled rapidly, so that by four in the afternoon there was a practicable breach sixty feet long.