Compounding the problem, the Japanese military made many wrong assumptions and major mistakes, the two most significant being: They wrongly assumed that any attack coming from the west would follow either the old rail line to Hailar, or head into Solun from the eastern tip of Mongolia.
除了這問題外，日本軍隊作出了很多錯誤假設和重大失誤，其中兩個最重要的是: 他們錯誤地認為，任何來自西面的攻擊要麼將沿前往海拉爾的舊鐵路線或從蒙古東面進入索倫。