The Anjiro Musket Regiment demonstration is a staged battle in which Yabu makes the tactical force of coordinated musket fire visible to Nebara Jozen and his men. Its importance lies in the reversal it stages: weapons long treated as inferior and dishonorable appear capable of breaking a conventional samurai assault, while the demonstration itself becomes a secret that must be protected at lethal cost.

Origins and Strategic Purpose

The display grows out of Yabu’s long-held theory that firearms could transform warfare. After the Portuguese introduced muskets and gunpowder to Japan in 1542, Japanese makers began producing firearms within eighteen months. Yet guns remained marginal: their quality lagged behind European weapons, bows were more accurate for hunting, and Japanese warfare prized individual hand-to-hand combat. The sword carried greater honor, while firearms were regarded as cowardly and contrary to Bushido, the warrior code of honorable combat, loyalty, and fearless service to one’s lord.

Yabu’s opportunity came when the captured ship’s stores revealed an extraordinary arsenal. He secretly ordered the removal of five hundred muskets, twenty cannon, five thousand cannonballs, and crates of fire arrows, directing that the supplies be concealed and sent to his castle at Mishima. The weapons were not simply treasure: they made it possible to test his idea in practice. He imagined five hundred selected samurai trained to fight as a musket unit, leading twelve thousand conventional troops, with specially trained cannon crews supporting them. In his view, a new era of warfare could make guns decisive despite the contempt attached to them.

The mock battle puts that theory before an audience whose reaction matters. Jozen and his men can see what the regiment can do, but Yabu also needs them to understand the threat they would face in a real engagement. The demonstration is therefore both a military exercise and a calculated disclosure: it persuades by showing, while risking the exposure of a capability Yabu has kept secret.

Formation and Volley Fire

The attackers dismount and initially appear to offer the kind of individual contests Jozen expects: warriors step out from the defending ranks to meet an equal number of opponents. The attackers then reorganize into five compact, disciplined phalanxes, each four ranks deep, with three formations in front and two held in reserve forty paces behind. At a command, they charge; when they reach range, they halt together and the front rank fires a deafening volley.

The firing sequence, rather than a single discharge, is the heart of the lesson. The first rank kneels to reload while the second fires over it; the third and fourth ranks follow in turn. The defending warriors fall in the staged engagement, and the valley fills with cries and confusion. Jozen initially reacts as though the weapons are killing their own side. He is told that the ammunition is blank and the men are acting, but that explanation does not diminish the tactical point: the exercise lets him imagine the same sequence with live bullets.

The defenders regroup and charge again. This time the front rank fires from a kneeling position, the second fires standing and then kneels to reload, and the following ranks repeat the pattern. The firing is imperfect: some musketeers are slow and the lines uneven. Even so, the imagined effect on a real attacking force is unmistakable. The counterattack falters and breaks apart; the defenders retreat in simulated confusion, leaving apparent casualties across the ground. Jozen recognizes that sustained, overlapping volleys could open a breach in a line that might otherwise hold together.

Reversal and Tactical Lesson

The exercise does not end with the musketeers simply holding their ground. The defenders regroup, commit their reserves, and launch a final general assault with swords, spears, and battle cries. The phalanxes break and flee. For a moment, the old hierarchy of combat seems restored: the disciplined gun line cannot withstand the fearsome close attack of the samurai. Jozen expects the attackers to be crushed as they run.

Then, on command, the fleeing formations regroup a hundred, two hundred, and three hundred paces away, this time in a V formation. They fire again. The attack falters, stops, and finally ceases under the repeated volleys. The shift from apparent rout to renewed formation makes the demonstration’s central tactical claim: firearms need not replace ordinary troops or survive an isolated sword charge. They can break and disorder an attacking line, after which conventional infantry and cavalry can exploit the opening and roll up its flanks. Jozen concludes that, under actual conditions, the two thousand defenders would have been slaughtered. The apparent deaths are staged, but some participants are genuinely hurt; once the game ends, the performers rise, collect their weapons, laugh or groan, and limp away.

Secrecy and Consequences

Jozen’s response confirms that the display has achieved its purpose. He congratulates Yabu sincerely, admits that he now understands what the regiment’s supporters meant, and says he would not want to attack it with real ammunition. Yabu is pleased by the judgment but also notes the weakness on display: the firing remains ragged, and the unit will need months of training. The scene thus presents the regiment as a consequential innovation, not a finished or flawless force.

The demonstration also creates an immediate security danger. Naga explains that Jozen and his men must die because they have seen the battlefield exercise and Ishido must not learn what it revealed. Jozen protests that he is protected by the Regents, then discloses that he has already sent a secret message by pigeon at dawn. A strangled pigeon is thrown at his feet, along with the severed head of Masumoto, the samurai Jozen had sent earlier with a scroll. The evidence of attempted communication sharpens the demonstration’s political stakes: the regiment’s power is inseparable from the struggle to control knowledge of it.

Yabu’s project also carries an unresolved conflict of values. His plan depends on weapons that Bushido marks as dishonorable, even as he seeks to use them in the service of samurai power. The mock battle does not settle that contradiction. It makes the practical argument harder to ignore: ritual expectations may shape the conduct of war, but an organized volley can expose their cost. By showing Jozen what disciplined firearms might do—and then treating that knowledge as dangerous—the demonstration makes military innovation both a tactical possibility and a political secret.