Oshi Castle

The Assault on Oshi Castle is the Hojo clan's last stand against the forces of Hideyoshi Toyotomi. With this victory, Hideyoshi took over all of Japan, bringing a temporary peace to the islands.

Role in Games
In Samurai Warriors 3, this battle is the replacement of or replaced by Odawara Castle. This is the last battle between the Hojo and the other clans. It is usually the third level for characters serving under the Toyotomi forces.

Yukimura's story sets this after he defended Ueda Castle. Meanwhile, Hideyoshi Toyotomi forced clan leaders all across Japan to surrender to his might. The last bastion of opposition was the Hojo clan in Sagami Province. After defeating Ujikuni Hojo, Mitsunari Ishida orders their units to form a defense. Kotaro Fuma appears near the front line, and if the Toyotomi stumbled there the enemy could rally. It is made an objective to defeat him. Lady Kai destroys the embankments after Kotaro is defeated, causing massive damage to the Toyotomi army. The enemy units attacking the main camp must also be defeated. Afterwards, Kunoichi leads a surprise attack on the Hojo main camp. The Toyotomi launched their own flood attack, but the enemy overcame it with the strength of will. This meant that the Toyotomi would have to break it with brute force. Advancing into the castle, they finally defeated Hojo Ujiyasu and victory was theirs.

In Kai's story, this comes after the struggle for Kai Province. Though Ujiyasu doubts their chances of winning, Kai encourages him. She is ordered to destroy the embankment, which creates a large chunk of casualties for the Toyotomi. After defeating Kanetsugu Naoe, Keji Maeda, Masamune Date, Yukimura Sanada, and Kunoichi, Mitsunari Ishida swears to take victory with his own two hands if he had to. This makes the gates of the Toyotomi main camp open. After Mitsunari charges out, he must be defeated. Ujiyasu is proud of Kai, but perishes shortly after. The Hojo clan follows his dying wishes by surrendering to Hideyoshi.

Historical Information
Oshi, which was a castle under the control of the Hōjō clan, was attacked by senior Toyotoomi retainer Ishida Mitsunari. Throughout this siege, Mitsunari used a prior strategy of Toyotomi Hideyoshi, that of diverting a river to flood the whole castle area. Mitsunari's victory in this siege had greatly assisted in the supremacy of his master.