Due to its location at western edge of then Kantō Plain, Hachigata Castle was regarded as a key to the control of Musashi Province and was a major stronghold for the Later Hōjō clan during the Sengoku Period.

He built a large barricade complex of wide dry moats and clay ramparts at the root of the hill, and extended the outer defensive line.

Unlike many other castles of the Hōjō clan, he made use of stone walls in vital areas, including the main gate, which were also to emphasize his power and authority.

[2] Takeda Shingen attempted to seize the castle in 1568 during the Siege of Hachigata,[3] but failed due to its extensive fortifications.

After the death of Takeda Shigen, Hōjō Ujikuni counterattacked and seized large portions of Kōzuke Province.