Battle of Hannyano
Date: 9/18 of Eishō 3 (1506)
Location: The village of Hannyano in the Tonami District of Etchū Province
Outcome: During a clash between the Nagao army and the Ikkō-ikki in Hannyano, Jinbō Yoshimune abandoned the Nagao which led to their loss including the death in battle of their leader, Nagao Yoshikage.
The Battle of Hannyano occurred on 9/18 of Eishō 3 (1506) in Hannyano in Etchū Province. The battle was waged between the Ikkō-ikki of Etchū and Nagao Yoshikage, the deputy military governor of Etchū. This is also known as the Battle of Seritanino.
Hosokawa Masamoto, the deputy shōgun of the Muromachi bakufu, proactively endeavored to reduce the influence of powerful shugo daimyō in an effort to increase his own authority. This triggered violent resistance from prominent clans including the Hatakeyama and Asakura. In Kaga Province, Jitsunyo, the high priest and ninth generation leader of the Hongan Temple who had his religious followers (known as the Ikkō-ikki) create an autonomous domain in Kaga, was under pressure from the Hatakeyama to the north and the Asakura to the south of Kaga. This gave reason for Jitsunyo to form an alliance with Masamoto to mitigate the threat from these neighboring clans.
In 1506, Jitsunyo ordered his older brother, Renkō, and younger brother, Rengo, who served as priests in the Hokuriku region to advance into the Asakura domain in Echizen and the Hatakeyama domain in Noto and Etchū. The attack against the Asakura to the south, known as the Battle of Kuzuryūgawa, stalled in the face of Asakura Sōteki, the infamous commander of the Asakura clan. To the north, the Hatakeyama were made vulnerable by an internal conflict in which Hatakeyama Yoshimoto, the military governor of Noto, had been usurped by his younger brother, Hatakeyama Yoshimune. Meanwhile, as a branch for the main family of the Hatakeyama based in Kawachi, Etchū was divided among the Yusa, the Jinbō, and the Shiina clans in the role of deputy military governors. This made it difficult for them to coordinate their response to the invasion by the ikki forces.
Afterwards, in Noto, pressure from retainers compelled Yoshimune to reconcile with his older brother, Yoshimoto (for which he relinquished the position of military governor to Yoshimoto two years later). The brothers joined forces to repel the ikki. Etchū became the center of opposition to the allied forces of the Hongan Temple and the Hosokawa into which the ikki surged.
Amidst these circumstances, Hatakeyama Hisanobu, the military governor of Etchū, was occupied fighting against Masamoto in the Kinai, so he requested support from Uesugi Fusayoshi, the military governor of neighboring Echigo Province to the north. At the time, Fusayoshi possessed little influence in Echigo, while the real authority had been taken away by Nagao Yoshikage, the deputy military governor. Nevertheless, Fusayoshi and Yoshikage feared the encroachment by the ikki into Echigo, so they responded to Hisanobu’s request for support.
In the seventh month, the Nagao army from Echigo attacked the followers of the Hongan Temple in the Tonami District of Etchū. The capture of this district would enable them to reach the border with their homeland of Kaga where the forces could join with the Asakura in a bid to conquer the province. On 9/18, the Nagao army and the Ikkō-ikki clashed in Hannyano in the Tonami District of Etchū. After colluding with the ikki, Jinbō Yoshimune fled from the front lines of the battle. This left the Nagao forces exposed, resulting in the death in battle of Yoshikage and annihilation of the Nagao army. Yoshikage’s son, Nagao Tamekage, regarded Yoshimune’s actions as a betrayal for which he sought revenge.
After the destruction of Nagao forces, the alliance between the Ikkō-ikki and Jinbō Yoshimune continued. Nagao Tamekage succeeded his father, Yoshikage, as head of the Nagao family, and in the following year, overthrew Uesugi Fusayoshi (the military governor of Echigo) which may have been retribution for the reluctance of Fusayoshi to send reinforcements when Yoshikage was in dire straits. Tamekage then focused on pacifying opponents within Echigo. In the eighth month of 1515, Tamekage invaded Etchū but was repelled. In 1519, after having pacified Echigo and receiving further requests from the Hatakeyama, Tamekage entered into an alliance with Hatakeyama Yoshifusa, the military governor of Noto (the son of Yoshimune and adopted son of Yoshimoto who had no natural heir), and decided to avenge the loss of his father, Yoshikage, by eliminating Jinbō Yoshimune. As compensation, the Hatakeyama promised to allocate the Niikawa District of Etchū to Tamekage.
With respect to the invasion of Etchū by the allied forces of the Nagao and Hatakeyama, the Ikkō-ikki remained neutral. Despite being forced into a bitter battle, Jinbō Yoshimune managed to endure, but, in the following year of 1520, he was subject to a second invasion and, after losing in the Battle of Shinjō on 12/22, killed himself and Tamekage achieved his revenge. Nevertheless, early in 1521, the Ikkō-ikki of Etchū revolted, and Tamekage struggled to suppress the disturbances. This served as the trigger for Tamekage to issue a prohibition against the Ikkō-ikki in Echigo. The conflict with the ikki persisted until a settlement was reached through the mediation of Hosokawa Takakuni in the fifth month of 1522. Thereafter, Tamekage focused again on battling against his opponents in Echigo.
Following upon the prohibition against followers of the Hongan Temple earlier issued by the Asakura clan in Echigo in 1506, the prohibition issued by the Nagao of Echigo in 1521 reflected the hatred of Tamekage toward the Ikkō-ikki that carried over to his son, Nagao Kagetora (later known as Uesugi Kenshin). The enmity of the Asakura and Nagao (later the Echigo-Uesugi family) toward the Ikkō-ikki did not readily absolve itself even after the advent of their common enemy in Oda Nobunaga, which is noted as one of the reasons why their coalition against the Oda known as the Nobunaga Encirclement did not ultimately succeed.