《旧五代史·后梁·列传三》
乾宁二年春天，太祖命大将朱友恭进攻朱瑾，挖掘堑壕包围他。
乾宁二年春，太祖令大将硃友恭攻瑾，掘堑栅以环之。
In the spring of the second year of Qianning, Emperor Taizu ordered his top general Zhu Yougong to attack Zhu Jin and put him under siege by digging trenches.