Toranaga activates Plan Five by secret message, turning a seemingly ordinary dispatch into the concealed trigger for a nationwide war mobilization. The plan’s code is designed to survive interception, and its scale reaches far beyond Osaka: it calls the Yoshi clan’s leaders to Yedo and prepares a coordinated campaign across fifty provinces. Yet its implementation is not presented as a simple path to victory. Toranaga believes that the plan may fail without him at its head, and regards avoiding its execution as preferable to unleashing it.

Political Cover and Deliberate Restraint

Before sending the activation signal, Toranaga discusses a separate message to Sudara: it will say that he intends to leave Osaka when the Council concludes its session, four days later. That announcement provides a specific, ordinary-seeming account of his next move, while a secret cipher carries the instruction that matters. The contrast between the two messages is central to the operation: what can be read on the surface need not disclose what has been set in motion beneath it.

The surrounding conversation also shows Toranaga resisting an immediate display of force. When Hiro-matsu asks whether he should call up ten thousand men for Osaka, Toranaga refuses. He says that the men already there are sufficient, thanks his old friend, and ends the discussion by saying he will sleep. The refusal does not mean that no larger military design exists. Instead, the scene places the visible force in Osaka beside an undisclosed plan whose orders are carried through a private channel.

The Signal and Its Safeguards

Once alone, Toranaga summons Kiri and gives her an immediate message for Sudara: all is well. She is to send it by racing pigeons, releasing three at dawn and repeating the release at noon. The message’s apparent reassurance conceals its operational meaning. Toranaga calculates that some birds will be lost to arrows, spies, or hawks, but expects that at least one will get through. Even if Ishido intercepts a message, Toranaga thinks, it will mean nothing unless Ishido has broken the code.

The cipher is known to only four people: Toranaga, his eldest son Noboru, his second son and heir Sudara, and Kiri. Its decoded instruction tells Sudara to disregard all other messages and activate Plan Five. The repeated dispatches make the order less dependent on a single bird or a single moment of transmission; the code makes the message unreadable to anyone who does not know how it works. Together, redundancy and secrecy give the brief phrase its force: a dispatch that appears to report calm is, for its intended recipient, an order to prepare for war.

What Plan Five Sets in Motion

Plan Five calls for all Yoshi clan leaders and their most trusted inner counselors to gather immediately at the clan capital, Yedo, and to mobilize. The signal for war is Crimson Sky. The preparations described are not improvised in response to the message: over the years, secret insurrections have been prepared in fifty provinces, and the targets—including passes, cities, castles, and bridges—have already been selected. Toranaga believes there are enough arms, men, and resolve to carry the operation through.

The contingency attached to Crimson Sky is equally stark. If Toranaga is assassinated or captured, the war becomes inexorable. Sudara, as heir, is to lead the legions in an immediate, fanatical assault on Kyoto to seize the city and the puppet Emperor. The prepared provincial risings would accompany that advance. Thus the plan links a private message to a chain of military and political actions: the clan is summoned, forces are mobilized, uprisings are coordinated, and control of the imperial center becomes the objective.

The Plan’s Limit and the Cost of Its Trigger

Toranaga’s confidence in the preparations is qualified by his judgment of Sudara’s readiness. He believes his son would fail, not from lack of courage, effort, intelligence, or loyalty, but because he does not yet have enough knowledge or experience and cannot bring enough of the uncommitted daimyo with him. Osaka Castle and the Heir Yaemon also stand in the way, serving as a rallying point for the enmity and jealousy Toranaga has accumulated over fifty-two years of war.

That long history is compressed into Toranaga’s recollection that his war began when he was six, sent as a hostage into an enemy camp, then reprieved, captured by other enemies, and pawned again until he was twelve. At twelve, he led his first patrol and won his first battle. Against that background, his belief that Sudara is not ready is not merely a judgment of family succession: the plan requires the practical experience and political authority that Toranaga thinks he alone can supply. He considers himself perhaps the only person who could win with Crimson Sky, while conceding that the Taikō could certainly have done so. His preference is not to use the plan at all. The message therefore carries both an instruction and a danger: it prepares the means of survival through war, while making clear that the campaign’s success may depend on the leader whose capture or death would trigger it.