粮尽援绝

Explanation: Food is used up, cut off reinforcements. Metaphor of fighting in a very difficult position. 　　Source: Song Yang Wanli, "Qian Zhao jurisdiction of public epitaph," the public to come forward with the troops, repeatedly Jie. Seven years, food aid must do, the potential can not be re-supported, then rates of thousands of his troops go south. "