《新唐书·列传·卷一百一十七》
至此粮食用完，每天只能发给士兵一小把米，只得啃树皮、煮纸充饥，仅剩千余人，都瘦弱不堪，而救兵又不到。
至是食尽，士日赋米一勺，龁木皮、煮纸而食，才千馀人，皆癯劣不能彀，救兵不至。
By now, the city was out of food, the soldiers were only given a small handful of rice each day, and resorted to eating tree bark and boiled paper to stave off hunger. There were only about a thousand men left alive, all emaciated; moreover, no reinforcements arrived.