《明史·列传·卷一百三十八》
杨应乾召募的辽兵派出去戍守宁远，和朝鲜商议派兵声援。
应乾所募辽卒出戍宁远，咨朝鲜使助声援。
The Liao soldiers recruited by Yang Yingqian were sent out to garrison Ningyuan, and they consulted with North Korea to send troops to support them.