human
About three weeks after the siege had begun, when the Roundheads were beginning to lose spirit, and Morgan's hopes were beginning to rise once more, a trooper rushed into the colonel's tent to say he had found a small cave below the top of the cliff which seemed to run up under the castle. The colonel's eyes blazed at the news, and he ordered the man to lead him instantly to the spot. Do you see a square grey patch on the face of the cliff up there, sir, nearly at the top, under the south corner?
gpt
Yes; what is it?