The Battle of Nagakudé was Toranaga’s victory over Lord Nakamura, then an upstart warlord without a formal mandate or title. The novel supplies little detail about the fighting itself; its importance emerges through Toranaga’s recollection of the political maneuvers that followed. The victory did not settle their contest. Instead, it began a sequence in which apparent friendship, family ties, and submission became instruments of power.

Background and Immediate Settlement

Shortly after the battle, Lord Nakamura chose conciliation rather than his customary overwhelming attack. He offered Toranaga a treaty of friendship and a binding alliance, to be cemented by marriage to his half-sister. She was already married and middle-aged, but neither fact prevented the arrangement: her husband, one of Nakamura’s vassals, returned her to her half-brother, and Toranaga married her with elaborate ceremony.

The marriage did not mean that Toranaga had abandoned independent calculation. On the same day, he made a secret friendship pact with the Beppu clan, Nakamura’s open enemies, whose lands lay against Toranaga’s exposed Kwanto frontier. He then waited for Nakamura’s expected attack. The contrast between the public alliance and this concealed agreement makes the battle’s aftermath a continuation of conflict by political means.

Hostages, Invitation, and Hidden Mobilization

Instead of attacking, Nakamura sent his revered mother into Toranaga’s camp, ostensibly to visit her new stepdaughter. Toranaga understood that she was also a hostage. Nakamura then invited him to a great gathering of the daimyos at Osaka. Toranaga considered the invitation carefully and accepted, while advising his ally Beppu Genzaemon that it would be unwise for them both to attend.

His acceptance concealed preparation for treachery: Toranaga secretly set sixty thousand samurai in motion toward Osaka. He left his eldest son, Noboru, responsible for the new wife and her mother. Noboru piled tinder-dry brushwood against the eaves of their residence and warned them that he would set it alight if anything happened to his father. The scene turns the alliance’s domestic arrangements into part of its military risk: the women are both relatives and leverage, while Toranaga’s army moves unseen toward the meeting.

From Private Bargain to Public Submission

The night before Toranaga was due to enter Osaka, Lord Nakamura visited him alone and unarmed. In their private conversation, Nakamura pressed him to join a campaign of expansion, first through the Kwanto and then across Japan, with ambitions reaching Korea and China. Toranaga’s response, recalled as “Let’s piss on the bargain,” came after he had secured what he wanted from the encounter.

The following day, before the assembled daimyos, Toranaga publicly offered his sword, lands, honor, and heritage to Nakamura and begged to serve his house. Nakamura accepted the submission, took Toranaga’s lands, and promised him the Kwanto as a fief once it had been conquered. He also ordered total war against the Beppu clan for its insults to the Emperor. The public ceremony therefore reversed the apparent position of the two men without erasing Toranaga’s private strategy: his defeat in posture and title became a means of preserving his place in the new order.

Political and Military Significance

Toranaga’s recollection links the victory at Nagakudé to a recurring pattern in his career: a visible concession can conceal a longer plan. The battle’s significance lies less in any surviving account of its tactics than in the chain it set in motion—marriage, a secret pact, a hostage, a mass movement of troops, and a public surrender. Later, Toranaga’s gift of a famous Minowara heirloom sword to Yabu recalls this earlier settlement: the sword had once been given to Toranaga by Nakamura as part of their agreement, and Toranaga had kept it for fifteen years.

The novel also places this remembered battle beside a later transformation in warfare without presenting the two as the same event. Portuguese firearms had reached Japan decades earlier, but guns remained a novelty beside the sword-centered ideals of samurai combat. Much later, Yabu’s disciplined musket demonstration showed how volley fire and coordinated formations could overwhelm conventional attackers in a staged exercise. The contrast sharpens the historical stakes of Toranaga’s victory: the battle belongs to a world where political authority is being remade, while the later demonstration imagines how military practice itself might change.