《资治通鉴·后梁纪·后梁纪二》
淮南军队包围苏州，推着用木架支撑、覆罩牛皮、形状如洞的洞屋攻城，吴越将领临海人孙琰在竹竿顶端安置滑轮，垂长索投锥把洞屋戳穿掀开，攻城的淮南军队便完全暴露了，炮石打来就张网拦阻，淮南军队不能攻克。
淮南兵围苏州，推洞屋攻城，吴越将临海孙琰置轮于竿首，垂纟亘投锥以揭之，攻者尽露，砲至则张网以拒之，淮南人不能克。
The Huainan army besieged Soochow, advancing with a cave-shaped shelter called a "cave house" propped up by a wooden frame and covered with cowhide. Sun Yan, a general from Linhai in Wuyue, mounted a pulley on the top of a bamboo pole, dropped a long rope, and used a cone to pierce through and lift the cave house, thus fully exposing the Huainan army besieging the city. When artillery was fired, it was intercepted by fishing nets, so the Huainan army could not conquer.