However, the family was defeated by the Kyogoku clan sent to look after Hida Province by the Muromachi bakufu (Japanese feudal government headed by a shogun), and split into the Kojima family (the head of the family) and the Furukawa/Mukaikojima family.
だが、室町幕府の派遣した守護京極氏に敗れ、一族自体も小島家（宗家）と古河家・向小島家に分裂した。