Kami-Akasaka-jo Castle had strong defenses that forced the bakufu army to engage in a bitter fight, but the bakufu army cut off the water supply to the castle in order that Shogen HIRANO would be forced to surrender.
上赤坂城の守りは堅く幕府軍も苦戦するが、城の水源を絶ち、平野将監らを降伏させた。