Tokugawa Ieyasu
Conflict chronology

Ieyasu deployed his forces in various fortresses in the Kōfu Basin to oppose Ujinao, who camped his army in the area of present-day Hokuto City. Hattori Hanzō led the Iga clan warriors to Katsuyama Castle (Kamisone-cho, Kofu City), Misakuchi Castle, and Kotohirayama Castle (Misakuchi-cho, Kofu City), where he monitored the Nakamichi road connecting the Kai and Suruga provinces. Furthermore, Ieyasu manage to recruit more samurai clans formerly served under various Takeda generals such as Ichijō Nobutatsu, Yamagata Masakage, and Hara Masatane, with the assistance of Ii Naomasa. Naomasa corresponding around 41 letters of submission to the Tokugawa clan. Furthermore, Naomasa also received another letter of submission from Obata Nobusada, leader of Takeda clan red armored cavalry troops.

In July 9, Masayuki changed his allegiance from the Uesugi clan to the Hōjō as he surrendered to Hojo Ujinao, and began building a system of forifications to station his vassals in Ueno Province. Subsequently, In July 12 as the troops under Hōjō Ujinao advanced across Usui Pass, Nobushige resisted them, abandoned the Komoro Castle, and retreated to a fortress which he deemed more suitable to defend against the Hōjō army. Later On July 16, Sadayoshi launched an attack on Fukashi Castle, forcing Dōsetsusai along with Hidemasa surrendered to Sadayoshi. Ujinao advanced his troops while leaving the siege against the castle to his general, Daidōji Masashige. Meanwhile, the Hōjō negotiate truce with the Uesugi in July 19 so they could focus the front towards the Tokugawa in Kai province, much to the dismay of Masayuki as he hoped to secure his territory in Numata instead from the Uesugi. The resistances of local warlords against Hōjō increased during this time, as an Ogasawara clan branch in Mishima Izu province under Ogasawara Hirokatsu also resisted the Hōjō clan. However, the Hōjō clan beating them in battle as Hirokatsu's father killed and he was forced to retreat into Mitsuba Castle in Suruga province. Meanwhile, the Enoshita clan, another local clan of former Takeda clan, which led by Enoshita Norikiyo, also showing their resistance against the Hōjō as they fought and beat a Hōjō troops detachment at the Battle of Sakaguchi.

In August 6, the main body of Tokugawa army led by Ieyasu met with and Hōjō clan main army stationed at Wakamiko castle, where series of engagements occurred between them. 8,000 of Tokugawa soldiers fought against around 50,000 soldiers of Hojo soldiers led by Hōjō Ujinao. As Ieyasu lined up at Shinpu Castle and Nomi Castle to the north, and fortified their defenses, various Skirmishes broke out during this phase, where the smaller Tokugawa forces manage to stall the much larger Hōjō forces. In the middle of this engagements, Sakakibara Yasumasa once stormed one of a castle belongs to the Hōjō, while Matsudaira Ietada harassing the Hōjō food supplies. Then the Tokugawa forces engaged in the battle of Kurokoma village against large army of Hōjō who has just received reinforcements from their ally, the Satomi clan, with fresh 10,000 soldiers led by Satomi Yoshiyori, ruler of Awa Province (Chiba). To break the stalemate on the frontline, Hōjō Ujinao ordered a 10,000 troops detachment led by Hōjō Ujitada to march on the periphery of Kurokoma, as they intended to encircle the Tokugawa army. Ieyasu realized the Hōjō's plan to encircle him, so he dispatched Mizuno Katsunari and Torii Mototada to lead 2,000 soldiers in raid operation to intercept them, where they manage to rout those Hōjō troops and prevent the encirclements. Katsunari and his colleague Yasusada Miyake assault caused panic among Ujinao soldiers. Hōjō Ujikatsu saw this and went to lead reinforcement to rescue Ujitada. However, Katsunari and Miyake managed to repel Ujikatsu's reinforcements too. despite some quarrel with Mototada as he viewed Katsunari being reckless and not following order, Katsunari were praised for his outstanding performance and received some rewards. Due to this daring raid by Mototada and Katsunari, the Hōjō army ultimately failed to encircle to Tokugawa army from behind. In the end, the Tokugawa clan manage to force stalemate, as the alliance of Hōjō and Satomi clan which far outnumbered Tokugawa cannot dislodge them from Kurokoma.

In August 12, after the series of Tokugawa clan victories over the Hōjō clan, former Takeda clan generals such as Kiso Yoshimasa, Hoshina Masanao, Yoda Nobushige, and many others, now gained confidence to openly declare their allegiance to Ieyasu. Seeing the trends, Masanao's father and brother, Masatoshi and Masaaki also defected to Tokugawa. In response, Ieyasu assigned his Hatamoto officer Shibata Yasutada as military inspector under Nobushige. At the same time, a Tokugawa army detachment from the Iga Province commanded by Hattori Hanzō invaded Saku District, where they also aided by Shinano local samurai warriors from Tsugane clan led by Öbi Sukemitsu. Up to this point, generally Ieyasu was still at a disadvantage of the war. In Saku district, he only had Yoda Nobushige which still struggling himself in guerilla against the Hōjō, as the bulks of Tokugawa new supporters such as the Takekawa and Tsugane clans of Kai, also suffering the shortage of provisions despite their number of anti-Hōjō forces continue to grew. In response, Yoda Nobushige taking initiative by contacting Masayuki to entice him to Tokugawa side. Taking advantage of the Hōjō setbacks, Masayuki had placed Yazawa Tsunayori in Numata Castle and his son Sanada Nobuyuki in Iwabitsu Castle, as he started to colluding with Ieyasu and Nobushige in secret.

In early September, Hattori Hanzō and Öbi Sukemitsu launched a night attack towards Egusuku Castle (also known as Shishiku Castle) and capturing it. Later, Hanzō also captured the Sanogoya castle in Izu Province under the cover of heavy rain, causing Ieyasu to elicit praise to Hanzō for this achievement. In the same month, at Yamanashi Prefecture, local former Takeda clan vassals led by Kōno Morimasa manage to defeat the Hōjō clan at Misaka pass.

In October 19, Sanada Masayuki openly declared his allegiance to the Tokugawa clan by attacking Nezu Masatsuna, a lieutenant of Hōjō Ujinao, and cooperating with Yoda Nobushige to resist the Hōjō clan forces around Komoro, as Ieyasu instructed. It was believed by historian that the Information about Masayuki's defection have reached the Hojo clan in early October, as there are document of letters from Sone Masatada and Yoda Nobushige praising Sanada Masateru for his success to convince Masayuki to join the Tokugawa side. In response for Masayuki betrayal, a commander of Hōjō forces named Fujita Ujikuni tried to capture Numata castle. However, he failed to do so as Masayuki resisted his attempt.

In October 21, the Tokugawa troops in Saku district manage to capture Mochizuki Castle. In response, the Hōjō side recalled Hojo Tsunanari and others from Kai Province, and ordered Nyudo Urano, lord of Ooto Castle in Agatsuma County, to immediately attack Iwabitsu Castle. Masayuki and Yoda Nobutaka then cut off communication between Komoro Castle and Tomono Castle. Later in October 24, Ieyasu issued Shuinjō (Red Seal Permit) to Masanao which granting him control for half of the Ina district, and he forced the Naito clan that had remained in Takatō Castle to switch their allegiance to the Tokugawa side. In November, Masanao attacked Minowa Castle, and caused Fujisawa Yorichika, the lord of who was on the side of Hōjō, to commit suicide. Masanao also expelled his grandson and annexed the Minowa territory. As a result, Masanao took control of Kamiina district around Takato Castle. In October 26, the Tokugawa manage to capture Ashida Castle, while Masayuki provided military supplies to secure the castle. Nobushige also captured Uchiyama Castle, successfully cutting off the Hojo army's supply route. Eventually, together with Masayuki, they occupied Usui Pass, and then captured Iwamurata Castle. Thus, the battle in Saku County was in Tokugawa's favor, and Masayuki retreated to his main territory.

Between November 1682 to January 1683, In conjunction with the main battles at Wakamiko and Kurokoma which still ongoing, Komai Masanao worked together with Torii Mototada and Ii Naomasa, along with Suwa Yoritada, who now has joined the Tokugawa rank, to attack Chikuma District which controlled by Ogasawara Sadayoshi. In February 10, Sadayoshi confirmed his allegiance to them as he has joined the Tokugawa side. Overall, in the duration of Ieyasu's fight against the Hōjō and the Satomi clan for 80 days, his ranks gradually increased and swelled as more than 800 former vassals of Takeda clan (900 according to Susumu Shimazaki) from Kōfu has joined Tokugawa clan to oppose the Hōjō.
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