《战国策·魏三·秦败魏于华走芒卯而围》
臣下听说魏国召集它近百个县的所有精兵，来留戍大梁，臣下认为不下三十万人。
 臣闻魏氏悉其百县胜兵，以止戍大梁，臣以为不下三十万。
I heard that Wei has gathered all its elites from all its 100 counties to protect Daliang. I think it’s not less than 300,000 people.