The robber, at his return to his company, valued himself much on the precaution he had taken, which he looked upon as an infallible way of distinguishing Ali Baba's house from the others; and the captain and all of them thought it must succeed. They conveyed themselves into the town with the same precaution as before; but when the robber and his captain came to the street they found the same difficulty; at which the captain was enraged, and the robber in as great confusion as his predecessor. Thus the captain and his troop were forced to retire a second time, and much more dissatisfied; while the robber, who had been the author of the mistake, underwent the same punishment, which he willingly submitted to. The captain, having lost two brave fellows of his troop, was afraid of diminishing it too much by pursuing this plan to get information of the residence of their plunderer. He found by their example that their heads were not so good as their hands on such occasions, and therefore resolved to take upon himself the important commission. Accordingly, he went and addressed himself to Baba Mustapha, who did him the same service he had done to the other robbers. He did not set any particular mark on the house, but examined and observed it so carefully, by passing often by it, that it was impossible for him to mistake it. The captain, well satisfied with his attempt, and informed of what he wanted to know, returned to the forest; and when he came into the cave, where the troop waited for him, said, "Now, comrades, nothing can prevent our full revenge, as I am certain of the house; and in my way hither I have thought how to put it into execution, but if any one can form a better expedient, let him communicate it." He then told them his contrivance; and as they approved of it, ordered them to go into the villages about, and buy nineteen mules, with thirty-eight large leather jars, one full of oil, and the others empty. In two or three days' time the robbers had purchased the mules and jars, and as the mouths of the jars were rather too narrow for his purpose, the captain caused them to be widened; and after having put one of his men into each, with the weapons which he thought fit, leaving open the seam which had been undone to leave them room to breathe, he rubbed the jars on the outside with oil from the full vessel.