《百战奇略·第二卷·寡战》
《北史》记载：西魏大统三年，东魏将领高欢率军西渡渭河后，直逼西魏华州，因华州刺史王罴防守严密难克，不得不转兵渡过洛水，而驻扎在许原以西。
《北史》：西魏大统三年，东魏将高欢渡河，逼华州，刺史王罴严守。乃涉洛，军于许原西。
The "Book of Northern History" records: In the third year of Xiwei Datong, after the Eastern Wei general Gao Huan led his army to cross the Wei River in the west, he went straight to Huazhou, Xiwei. Because the governor of Huazhou, Wang Pi, defended tightly and was difficult to conquer, he had to turn his troops to cross the Luo River and station at the west of Xu Plain.