Nitta Yoshisada
The fortress was first attacked in August 1338 by a small force under Nitta Yoshisada, numbering roughly fifty horse, in what would come to be known as the Battle of Fujishima. Hosokawa Akiuji had been ordered by Ashikaga Takauji to aid Shiba Takatsune in the defense, and encountered Nitta's force a short distance from the fortress.