After Kasai Haruminobu died outside Kamitoriyama Castle, Kasai Yoshishige quickly succeeded to the position of Kasai family's governor with the support of some powerful retainers of the Kasai family, and was served by the head of Higashiyama Nagabe Castle, the head of the family's relatives.

However, immediately after Kasai Yoshige succeeded the Kasai family's governor, he did something that most people could not understand - he voluntarily relinquished the castles of Saguma Castle, Ariga Castle, and Yongya Castle that had captured the Osaki Domain, and returned them to the Osaki family. Kasai Yoshishige thought that in order to gain the trust of the Osaki family and better cooperation, it was natural for him to give up some castles and territories. However, not everyone in the Kasai family thought that way.

On October 14, the second year of Eiroku, Naotsuna Tomizawa, the owner of the Tsurumaru Pavilion, saw that Kasai Yoshishige had ordered him to hand over the captured Miyano Castle and return it to the Osaki family, he was very dissatisfied with this, and on the same day he summoned troops to raise a counter-flag against Kasai Yoshishige at the Tsurumaru Pavilion, and quickly sent people to contact Mori Keihiro, Saito Toshi, Kankawae Mitsutoshi, Kankawae Hirotoshi, Oshikiri Beizen and other Uesugi retainers, hoping that the Uesugi family could give support and assistance.

Maori Jingguang had no intention of asserting himself this time, and immediately reported to Tao Qingxian, who was just gathering troops in their respective territories with the rest of the generals to prepare for war.

When Kasai Harunobu ordered Tomizawa Naozuna to send troops to attack the Osaki family, he let him freely cut the Osaki domain around Miyano Castle, and Tomizawa Naotsuna didn't expect that as soon as Kasai Yoshishige came to power, he would spit out the nearly 10,000 stone territory that he had finally obtained. It would have been nice if Kasai Yoshishige could have compensated some of the Kasai family's direct leaders to Tomizawa Naotsuna, but Kasai Yoshishige didn't even think of compensating the generals who gave up the former Osaki Domain.

When Kasai Yoshishige learned that Tomizawa Naotsuna had raised the anti-flag against him, instead of reviewing his own mistakes, he ordered Iwabuchi Scripture, the lord of Yongjin Castle, Iwabuchi Shintsune, the lord of Fujisawa Castle, and Nishigun Nobuji, the lord of Kosui Castle, to quickly crusade against the rebellious Tomizawa Naotsuna.

However, the development of events was unexpected. Iwabuchi Scripture, the lord of Yongjin Castle, was also ordered by Kasai Yoshishige to surrender the Ariga Castle that captured the Osaki family, and after he had recruited his army, he did not join forces with Nishigun Nobu and other generals, but responded to the rebellion of Tomizawa Naotsuna in his own home city, Yongzu Castle Cage Castle. Seeing this, the Fujisawa Iwabuchi family, the clan of the Yongjin Iwabuchi family, also rebelled with the cage city.

With the rebellion of the Iwabuchi Sutra, Iwabuchi Creed and others, the Kasai family's main base, Terike Castle, was in a state of being attacked from both sides. Kasai Yoshishige began to panic at this moment, and he had no choice but to immediately send people to Shizugawa Castle and Tonokan and other places to ask for the assistance of the lords of the country, such as the Motoyoshi family, the Magome family, and the Nakadate family.

What Kasai Yoshishige didn't expect was that the Motoyoshi family in Shizugawa Castle suddenly changed governors at this time. Shigetaka Motoyoshi, the lord of Shizugawa Castle, gave up the post of governor of the Motoyoshi family to his son, Shigetaka Motoyoshi, on the grounds of his advanced age. After becoming the governor of the Motoyoshi family, Motoyoshi Shigetsugu immediately announced that the Motoyoshi family had fallen to the Uesugi family, and also took the initiative to send troops to attack Lake Water Castle, Sonuma Castle and other places to relieve the pressure on Mori Jingguang and others.

As one after another Kasai retainers or kokuren lords fell to the Uesugi family, the coastal kokun lords, such as the lord of Tonokan Shigeyin and the lord of Higashidate Castle, Hamada Hirotsuna, raised troops to rebel against the Kasai family. Kasai Yoshishige, who had managed to unite the Kasai family and temporarily stop the civil strife, is now completely alone in the Chu-Tsu area.

Tao Qingxian was currently marching to Shiraishi Castle with an army of 10,000 troops, but in order to be able to completely isolate the Osaki family, he ordered the generals of Chutsu Oku, such as Mori Keihiro, Saito Toshi, Kankawae Mitsutoshi, Kankawae Hirotoshi, and Oshiki Beizen, to go out of Terike Castle, and must first attack the Kasai family's main base Terike Castle to deter the countrymen and lords under the command of the Hokuriku Oku Kasai family.

After receiving Tao Qingxian's order, Maori Jingguang and others notified Fukuchi Nobuyoshi in Diaowei Castle of this order, and Fukuchi Nobuyoshi immediately led an army of 2,000 troops to Sichi Castle as soon as he saw Tao Qingxian's order. Nobutoshi Fukuchi was very grateful to Asada, because Asadachi not only gave him the old head of the Yamauchi Shouto clan, but also Ishinomaki Castle, the origin of the Kasai family, and his status in the Uesugi family was already comparable to that of a small daimyō. Because of this, Nobuyoshi Fukuchi needs to work harder.

However, Fukuchi Nobutoshi encountered a problem at this time - Onodera Michi, a wealthy family who ruled part of Teraike Township and came out of the Kasai family, blocked his way.

Although Onodera Michiteru did not have many troops, he was stationed in the branch city of Tenjinyama Castle, which was stationed in the southeast of Teraike Castle, and he was in the way of Fukuchi Nobuyoshi on the way to Teraike Castle.

Fukuchi Nobuyoshi didn't think too much about it at first, and directly led the army to launch a fierce attack on Tenjin Mountain Castle. However, what Nobutoshi Fukuchi didn't expect was that Onodera Michiteru had already made a lot of preparations before his arrival. Onodera Michiteru not only added to Tenjin Castle, but also built a lot of arrows and iron cannon holes.

Not only that, Onodera Michiteru also specially prepared a large number of equipment to defend the city, such as skulls, horses, thistles, water chestnuts, etc.

Tools: Tools, that is, throwing tools to kill enemies. 檑 originated in the Zhou Dynasty, the original sound is a "抡" word, that is, waving the arm to throw out, and after a long time the sound becomes "檑", because after throwing rumbling like thunder rolling, it is gradually officially written as "檑" or "thunder". "Zhou Li, Autumn Official, Career Jin Shu" cloud: "Thunder, the tool of guarding the city." "As a weapon, the skulls are only the name of a type of weapon that condescendingly throws and kills, but it is actually divided into various names according to its use. There are five most commonly used types: first, the wooden skewer, which can also be called a squirt, is made of a whole thick log, four to six feet long, at least four inches in diameter, and is not limited in thickness; The wood is inlaid with iron nails and thorns, which are continuously pushed down the city walls, destroying siege ladders and killing and wounding enemy troops. Second, mud - to clay mud, every thousand catties of mud add pig bristles and horsetail hair 30 catties, pounded and rolled out, each sash is two or three feet long, at least five inches in diameter. After the mud dried, it was as hard as copper and iron, heavy as a boulder, flexible as leather, and still intact after being smashed from a high altitude and colliding with the city wall.

Horse rejection: Horse rejection, that is, an obstacle that blocks the war horse. In the Xia, Shang and Zhou dynasties, there were early rejection horses, that is, wooden pillars were crossed and fixed into a shelf, and the shelf was inlaid with sharp objects with blades and thorns (copper knives or stone knives). During the Spring and Autumn Period and the Warring States Period, the Mohists called the rejection of horses "sharp iron", and there was a special article in "Mozi" on the "sharp iron" tactics of "Prepare Moth Fu": moth Fu, enemy soldiers moths and ants poured in, at this time, along the way to lay five lines of sharp arrows, three feet between rows, three feet buried at the root, five feet long with a sharp cone, can block the enemy's advance.

Tribulus terrestris, iron water chestnut: This is a small weapon thrown on the main road of the march to specifically stab the horse's feet and intercept the enemy cavalry. Tribulus terrestris, that is, thorny wild shrubs, grow all over the country, but they are the most common wild plants and trees. In ancient times, people often picked a large number of thistles between the mountains and threw them on the road to delay the enemy's men and horses. However, it is inconvenient to pick temporarily, so there is thistle made from broken wood blocks. It is recorded in "Liutao, Hutao, Military": "Tribulus terrestris, two feet five inches to the ground, (furnishing) one hundred and twenty bodies...... Narrow road micro path, Zhang Tie Tribulus terrestris, its height is four inches, eight inches wide, more than six feet long, (road section layout) 1,200 bodies. Defeat to ride. "This thistle terrestris was invented after the advent of iron tools - to create thistle-shaped spikes out of iron sheets. During the Spring and Autumn Period and the Warring States Period, the Mo family was good at defending the city, and the "Mozi Beixue" has a record of the tactics of setting up a large number of thistles at the entrance and exit of the tunnel, outside the city gate, and in the river.

Onodera Michiteru arranged all the sashs in Ninomaru in Tenjin Castle, and the horses were placed at Otemon and Toranoguchi. And small weapons such as thistles and iron water chestnuts are scattered in large numbers on the main roads on the slopes to the east and west of Tenjin Mountain Castle.

Just after Onodera Michisho was ready, he sent someone to ask Kasai Yoshishige to send reinforcements to support Tenjin Mountain Castle, otherwise he would not be able to support it for long with the less than 500 defenders in the castle.