Siege of Suemori

What Happened

On 12 October 1584, Maeda Toshiie (前田利家) arrived at Suemori Castle in the middle of the night and broke the siege that Sassa Narimasa (佐々成政) had been pressing for three days. Narimasa had surrounded the castle on 9 October with 15,000 men. The garrison, commanded by Okumura Nagatomi (奥村長福) and his wife Katō Tsune (加藤つね), had held out to the limit of its strength, and by the time Toshiie's relief force appeared its position had become desperate.

The battle ended in a victory for the defenders and for Maeda Toshiie. Narimasa's forces were defeated and the siege was lifted.

The engagement belongs to the Azuchi–Momoyama period (安土桃山時代, Azuchi–Momoyama jidai), the decades of unification under Oda Nobunaga and then Toyotomi Hideyoshi, and it falls within the broader Sengoku period (戦国時代, Sengoku jidai) of endemic warfare among regional lords. The year 1584 was the twelfth year of the Tenshō era (天正十二年, Tenshō jūninen).

Background

The siege grew directly out of the Battle of Komaki and Nagakute, the 1584 confrontation between Toyotomi Hideyoshi and Tokugawa Ieyasu. That conflict split the warrior houses of central Japan into two camps, and it split former comrades from one another.

Sassa Narimasa took the side of Tokugawa Ieyasu. Maeda Toshiie, who had once been Narimasa's companion in arms, stood with Toyotomi Hideyoshi. The two men who had fought alongside each other now faced each other across a battlefield, and Suemori Castle was where their quarrel came to blows.

Narimasa moved first. On 9 October 1584 he invested Suemori Castle with a force of 15,000. The castle was held by Okumura Nagatomi, who defended it together with his wife Katō Tsune. For three days the garrison resisted, but the disparity in numbers told, and the situation inside the walls grew increasingly desperate. Relief depended on Maeda Toshiie, and Toshiie came — arriving in the middle of the night and falling on Narimasa's besieging army.

Why It Mattered

The immediate result was the survival of Suemori Castle and the defeat of Sassa Narimasa's attempt to take it. A garrison that had been reduced to desperation was saved by a night attack, and one of Tokugawa Ieyasu's allies in the region had been checked by force.

The longer consequence concerned Maeda Toshiie. After the defenders' victory at Suemori, Toshiie became the most powerful daimyō (大名, a great territorial lord) in the Kaga region — the area corresponding to modern Ishikawa Prefecture. That position at the head of the Maeda house in Kaga would define the family's standing for the whole of the following Edo period, when the Kaga domain ranked among the largest in Japan.

The siege also marks a personal rupture. Narimasa and Toshiie had been companions before they were enemies, and Suemori is the point at which that old association was settled on the field. The battle is remembered less as a set-piece of the Komaki and Nagakute campaign than as the moment the Maeda ascendancy in Kaga was secured.

The Name in Japanese

The Japanese name of the battle is 末森城の戦い.

• Kana reading: すえもりじょうのたたかい
• Romaji: Suemori-jō no tatakai

Breaking the name into its parts:

末 — read sue here. The character means "end," "tip," or "last." It is the first element of the place name Suemori.

森 — read mori. It means "forest" or "woods." Together, 末森 (Suemori) is the name of the castle and the locality.

城 — read jō in this compound. It means "castle." Note that the same character can also be read shiro when it stands alone; in compound names like this one, the Sino-Japanese reading jō is standard. So 末森城 (Suemori-jō) is "Suemori Castle."

の — read no. This is the possessive and linking particle. It joins the castle name to the word that follows, in the same way an English "of" would.

戦 — read tatakai here, though its Sino-Japanese reading is sen. It means "war," "battle," or "fight." The verb behind it, 戦う (tatakau), means "to fight." Written alone as a noun, the character is normally read tatakai.

い — the final kana, completing the reading tatakai. It is written in hiragana rather than as a kanji, which is why the word appears as 戦い rather than as a single character.

Put together, 末森城の戦い is literally "the battle of Suemori Castle." A shorter form, 末森の戦い (Suemori no Tatakai), is also used, dropping the character for castle. Readers studying Japanese will meet the pattern 〜の戦い (~ no tatakai) constantly in battle names, and 〜城 (~jō) constantly in castle names; this title uses both.

Key Figures

Sassa Narimasa (佐々成政) — the attacking commander. He laid siege to Suemori Castle on 9 October 1584 with 15,000 men, acting in support of Tokugawa Ieyasu against Toyotomi Hideyoshi. His forces were defeated by Maeda Toshiie.

Okumura Nagatomi (奥村長福) — the commander of the castle's defence. He held Suemori Castle through the siege alongside his wife, Katō Tsune, until relief arrived.

Katō Tsune (加藤つね) — Okumura Nagatomi's wife, who defended the castle with him to the fullest extent during the desperate days before Maeda Toshiie's arrival.

Maeda Toshiie (前田利家) — the relieving commander. A former companion of Sassa Narimasa, he had sided with Toyotomi Hideyoshi. He arrived in the middle of the night, defeated Narimasa's forces, and after the victory became the most powerful daimyō in the Kaga region.

Tokugawa Ieyasu (徳川家康) — the leader whose cause Sassa Narimasa supported at Suemori, in the wider conflict of 1584.

Toyotomi Hideyoshi (豊臣秀吉) — the leader whose cause Maeda Toshiie supported, and the opposing side in the same conflict.