While Cao held a banquet for his Mongol officers on the night of August 6, two of his Mongol officers slipped away from the festivity and leaked Cao's plot to the high-level Mongol commanders Wu Jin (吴瑾) and Wu Cong (吴琮) around 1:00 to 3:00 AM on August 7.
Saat Cao mengadakan jamuan bersama pejabat Mongol pada malam hari tanggal 6 Agustus, dua pejabat Mongol keluar dari jamuan dan membocorkan rencana Cao kepada komandan tingkat tinggi Mongol Wu Jin (吴瑾) dan Wu Cong (吴琮) pada sekitar pukul 1.00 hingga 3.00 dini hari tanggal 7 Agustus.