D'Aubusson now set to work in another direction to counteract the efforts of the Turks. He erected an immense wooden catapult, which threw huge pieces of rock into the midst of the Turkish works, crushing down the wooden screens erected to hide their approaches, breaking in the covered ways, and causing great loss of life among the besiegers. At the same time galleries were driven below the breach, opening into the ditch, where their exits were concealed by masses of rubbish. Through these strong working parties issued out at night, and carried away up the passages the rocks and other materials that the Turks had, during the day, brought, with immense labour, from a distance to the shoot. The materials so carried away were piled up behind the retrenchment, greatly adding to its thickness and strength.