The preface of category A features detailed descriptions, whereby the attacks on Tsusima and Iki Provinces by the coalition army of the Yuan Dynasty and Goguryeo are described in detail as the explanation of Bunei War, one of Genko (Mongol invasion attempts against Japan).
一類は前文が具体的な内容になっており、元寇文永の役についても元(王朝)・高麗連合軍による対馬国・壱岐国の侵攻が明記されている。