Twenty-first day of the tenth month

The Twenty-first day of the tenth month is the date of the final military decision in the novel: at dawn, the main armies clash near Sekigahara, and by late afternoon Toranaga has won. The day’s movement from fog and sleet to victory gives a precise temporal marker to the struggle for power; its aftermath confirms that the contest has become a new political order enforced by force.

Date and Setting

The battle takes place in the mountains near Sekigahara, astride the North Road. The account identifies the day as falling in the Month without Gods and begins at dawn. Foul weather—first fog, then sleet—accompanies the armies’ encounter, while the outcome is established by late afternoon. The compressed span from first clash to victory gives the date its decisive character: the long political crisis becomes an explicit battlefield result within a single day.

The Battle in the Novel’s Military Context

The novel has already presented weapons and military organization as sources of strategic change. When Yabu discovers the arms aboard the captured ship, he counts five hundred muskets, twenty cannon, and abundant ammunition, and imagines using selected, drilled musketeers with conventional troops. That plan collides with the samurai ideal that treats firearms as dishonorable beside the sword. Later, a demonstration makes the tactical possibility concrete: disciplined ranks fire in sequence, regroup, and defeat a simulated charge. These earlier episodes establish the tension between inherited martial honor and organized gunfire, but the account of the battle on this date does not specify which weapons decide it. Its stated facts are the armies’ clash, the weather, and Toranaga’s victory.

Victory and Aftermath

The victory is followed by slaughter: forty thousand heads are taken. Three days later, Ishido is captured alive and sent in chains to Osaka for public viewing. Toranaga orders him planted upright in the earth with only his head exposed, where passersby are invited to saw at his neck with a bamboo saw. Ishido lingers for three days before dying. The sequence ties the date not only to military defeat but to the public humiliation and death of Toranaga’s principal rival. In the novel’s closing chronology, the twenty-first day therefore marks the passage from a contested succession and looming war to Toranaga’s undisputed victory.