In the battle of the Osaka-jo Castle, because of struggle of roninshu and the defending capability of Osaka-jo Castle, the troops of the bakufu fought against heavy odds and, although they tried to invade the castle, they were beaten back every time and, especially during the battle at Sanadamaru, the bakufu side suffered heavy casualties.
大坂城での戦闘では浪人衆の活躍や大坂城の防御力により、幕府軍は苦戦、城内に攻め入ろうにも撃退ばかりされ、特に真田丸の戦いでは幕府方が手酷い損害を受ける。