In the second year of Yongroku, mid-December. When Kasai Yoshishige heard that tens of thousands of Uesugi troops had arrived at Aoshinoshi Castle, he immediately summoned the retainers Eishishi Maru (Eisho Terushige, one of the seven members of Kasai, the commander-in-chief of Eshishi), Yoneya Tsunehide (one of the powerful officials), Kagawa Yoritsu (Kasai Ichimon, Ke Fenge, and Zuo Noshiza), and Kawa Mitsumura (and Kawashuru), Takejin Shigenobu, Hisamitsu Mishishige, Onodera Nobutaka, Kashiwayama Akikuni (Kashiwayama Akiyoshi's son) and others to discuss countermeasures.

At the same time, Mori Keihiro, Kankawae Mitsutoshi, Kankawae Hirotoshi, Saito Toshi, Mori Takacho, and Mori Takamasa will prepare for an attack on Aoshinojo Castle after a short rest. Qingshio Castle is a very inconspicuous small city, located in the 'belly' of Monomi Mountain, surrounded by dense forests and dangerous peaks, easy to defend and difficult to attack, the defenders are only more than 300 people, the city lord is Kikuchi Dingheng, a heavy minister of the Jiang Thorn family. At this time, once the Uesugi army captured Aoshinoshi Castle, then Iwatani Hall Castle would be in no danger to defend, and the Uesugi army would be able to ensure the safety of the grain route. As a result, Mori Keihiro sent an envoy into the city, so that Kikuchi Dingheng would recognize the overall situation and immediately lay down his arms and surrender to the city.

However, Kikuchi Dingheng rejected Maori Jingguang's request for surrender, and said to the envoy: "Dingheng is the lord of this city, if he surrenders without a fight today, he will become a laughing stock one day!" After sending off the envoy, Kikuchi Shotsune, along with Ota Shiyo Mamoru and Kamosawa Samasuke, and all the castle soldiers of the clan, made up their minds to live and die with the castle.

After seeing that Kikuchi had refused his request for surrender, Mori Keihiro ordered Saito Toshishi and Kankawae Mitsutoshi to attack Aoshinoshi Castle from the front in the direction of Otemon, and Mori Takasa and Mori Takamasa went to the flank of Aoshino Castle and waited for an opportunity to climb over the fence of Aoshino Castle and climb into Honmaru.

Subsequently, under the desperate charge of Saito Shunji and Kankawae Mitsutoshi, the Uesugi army climbed over the outer trench of Aoshinoshi Castle, took control of a slope under the Otemon Gate of Aoshino, and fired at Aoshino Castle in turn after the iron artillery team arrived. An hour later, Mori Takamasa and Mori Takacho led their troops to climb over the fence and climb into the Honmaru of Aoshinojo Castle, where they set fire to the Honmaru and announced the fall of Aoshino Castle. The castle lord Kikuchi Shotsune fought bloodily with a family of Ota Daii Iyomori, Kamosawa Samasuke and a few samurai until the last moment, only a few of the Kikuchi family, Ota Dai, and Kamosawa families fled out of the city, and most of the more than 300 city soldiers were killed.

After the fall of Aoshino, Mori Jingguang immediately led his army into the plains. After losing his original advantages such as time and location, Kasai Yoshishige had to gather his forces at Iwatani Castle, the original base of the former Jiang Thorn family, and instructed his retainers to fight to the death, putting on a posture of preparing for a decisive battle with the Uesugi army.

When Mori Keihiro learned that Kasai Yoshishige was preparing to defend Iwatani Castle and was gathering a large number of troops with the intention of fighting him in a decisive battle in the plains outside Iwatani Hall, he decided that his goal of forcing the Kasai family to surrender after capturing Aoshinoshi Castle was no longer possible. Subsequently, Mori Jingguang sent Mori Takamasa, Mori Takatsu, Hanhee Mitsutoshi, Hanhee Hirotoshi and other generals to lead an army of 5,000 troops to attack Iwatani Hall Castle in two ways. However, under the desperate resistance of Kasai Yoshishige, Eiji Takashi and others, Mori Takamasa, Mori Takata, Hanhee Mitsutoshi, Hanhee Hirotoshi and others will be repelled by the Kasai Army.

At this moment, the Mori Keihirobe went deep into the hinterland of the Kasai family, and there were Katsusai's national lords or retainers in front and behind, although they occupied a green castle, but the situation was already unfavorable to the Uesugi army, and once they were attacked from both sides by the Kasai army, the Mori Keihirobe would have nowhere to escape.

After seeing that Mori Takamasa, Mori Takatsu, Hanhee Mitsutoshi, and Hanhee Hirotoshi were about to be defeated and returned to Aoshinoshi Castle, Mori Jinghiro explained to him that Iwatani Tang Castle was strong, and that the Kasai army was fighting to the death, and it was difficult to win, so he was angry. Subsequently, Maori Jingguang strictly ordered Maori Gaozheng, Maori Gaoding, Hanhejiang Guangjun, Hanhejiang Guangjun and others to return to the division to fight to the death.

Just as the Kasai army was victorious, the former head of the Kasai Iebunuchi Pavilion Tochiuchi Military Department (Xifeng Stable, Ukio Fang Hiromoto's brother-in-law) suddenly fell to the Uesugi army and delivered military rations and baggage to the Uesugi army. Not only that, but the Tochiuchi Military Department also took the initiative to lead more than 100 people to serve as the vanguard of the Uesugi Army, and successfully deceived the gate of Iwatani Hall Castle Kitanomaru. Previously, the Kasai family had attacked the Saifukan of the Ufu Fang family in the third year of Hongji, and the governor of the Ufu Fang family, Ufu Fang Hiromoto, and the eldest son, Ufu Fang Guang, and the second son were killed by the Kasai army, and only the third son, Ufu Fang Hirohisa, escaped after changing his name to Zephyr University. In order to keep the bloodline of the Ufu Fang family, the Tochiuchi military department could only swallow his anger and surrender to the military gate of the Kasai family.

Subsequently, the Uesugi army, which was immediately behind the headquarters of the Tochiuchi Army, swarmed in. Helplessly, although the Kasai army did not retreat from the fight, it was still outnumbered in the end, and the Kasai army began to break up after resisting for a period of time and was defeated. Kasai Yoshishige and Egsaki Tsuneshi, Yoneya Tsunehide, Yoriyoshi Kagawa, Shigenobu Takeshi, Hisamitsu Mishige, Nobutaka Onodera, Kashiwayama Akikuni, and Kounai with a sword (a member of the Eksaki family) and others were killed in battle, and more than 1,000 city soldiers were all killed.

The Battle of Iwatani Castle was extremely tragic, and the Kasai army was beheaded from the general Kasai Yoshishige down, and the Uesugi army encountered a bitter battle for the first time after entering the Hokurichi area, but this battle also made the Uesugi army powerful in the Hokurichi area. Mori Keihiro and other generals marched into the hinterland of the Kasai family under the leadership of the Tochiuchi military department without waiting for the completion of the battlefield, and Obayashi Castle, Maezawa Castle, Hitoshou Castle, Mizusawa Castle, Toyota Castle, Kawasaki Castle, Kazuzawa Castle, and Aigo Castle were easily captured by the Uesugi army, and the remnants of the Kasai family, Chida Shigetaka, Mita Shigeaki, Shintodo Yoricho, Hosoya Shiyin, and Nagabe Tadashi were successively begged to death.

Due to the in-law relationship between the Waga family and the Kasai family, the Kasai family's Kashiwayama family, Waga Yoshikatsu (Waga Yoshiharu) had to stop the confrontation with Nanbu Harumasa in Yante-gun, and he first sent Kudo, Narita Fujiuchi, and Ueno Nagato to lead an army of 500 south to the direction of Obayashi Castle.

However, Waga Yoshikatsu did not know the exact number of Uesugi troops, so the generals he sent such as Kudo Chief, Narita Fujiuchi, and Ueno Nagato were surrounded and annihilated by the Uesugi army outside Obayashi Castle, and none of the more than 500 troops returned to Waga. Maori Jingguang then sent all the heads of the more than 500 Hehe army to Erzicheng, and then sent 8,000 troops north to attack Heheling.

When the results of the Battle of Iwatani Castle and the news of the destruction of the Kasai family reached Takasuidaji Castle, the Takasuiji clan Toshi of the Takasui Temple, who had previously joined forces with the Tozawa family, the Hiyama Yasuyama family, the Kasai family, and the Osaki family, began to panic, and he had to deal not only with the southward movement of the southern family, but also with the upcoming invasion of the Uesugi army. After consulting with his family's retainers, Spo decided to surrender to the Uesugi army in order to save his retainers and people from being killed by the Uesugi army.

However, the elders of the Takasuida-Spo family, Ryoda Kantai and Iwashimizu Yoshito, opposed Spo's approach and immediately secretly contacted Minami Harumasa, hoping that he would capture the Takasuiji Spo domain when the Uesugi army was engaged with the Waga family.

As soon as Nanbu Harumasa learned of Spo's intention to surrender to the Uesugi army, he immediately ordered Fukushi Masahide, the owner of the Fukurakan Pavilion, who was close to the Spo of Takasui Temple, the lord of Numanomiya Castle, the lord of Numanomiya Tsuneri, the owner of the Shimoda Pavilion, Shimoda Yazaburo, and the owner of the Hitokan, Hido Hidetsune, to lead their troops south to attack the Takasuiji Temple Spo family's Pig Gokan and Mizenkan, and at the same time ordered the Kunjin lord Sentoku family and the Tian Suo family near Miyako Bay to send troops to Akasawan Pavilion. He was to gather the military strength of his relatives and countrymen lords, intending to take advantage of the fierce battle between the Uesugi generals such as Mori Keihiro and the Waga family, and seize the five counties of Yansate, Shuyi, Shiba, Waga, and Barnyard in one fell swoop.

However, Southern Harimasa still overestimated the ability of Yoshikatsu Kazuka and the strength of the Waga family.

On December 29, Mori Keihiro and other generals led their troops to capture Iwasaki Castle, and the imperial castle holders of the Waga family, Kawaharada Genzo, Haruyama Nagato Mamoru, Yuzawa Hayatomasa, and Coal Sun Sosuke were to be killed, and none of the 500 castle soldiers were spared. Knowing the result of the battle of Iwasaki Castle, the lord of Ediaoko Castle, the Shosuke of the Ediao Shobu Shosuke, immediately abandoned the castle and fled, and the Uesugi army soon came to the castle with bloodless soldiers and the He family to occupy the castle of Futako. At this time, there were only more than 400 city soldiers in Erzicheng, and the people in the city were panicking. In desperation, Kazuga Yoshikatsu had no choice but to send his retainers to the barnyard house to ask for reinforcements.