At first, the Hojo clan was highly motivated in fighting the war, beating the Sanada and Ida clans invading from Usui-toge Pass, and scouting to discover the force levels of warlords on the Toyotomi side in the Suruga-Izu border, and so so on, but after Hideyoshi arrived at Numazu, the Hojo clan lost the following battle and was forced to surrender Yamanaka-jo Castle.
当初は碓井峠を越えてきた真田・依田に対して勝利し、駿豆国境方面でも布陣する豊臣方諸将に威力偵察するなど戦意は旺盛であったが、秀吉の沼津着陣後には、緒戦で山中城が落城。