Sakuma Nobumori

Who They Were

Sakuma Nobumori (佐久間信盛) was a samurai retainer of the Oda clan, born in 1527 in Minami-ku, a district of the city of Nagoya in Owari Province. His father was Sakuma Nobuharu (佐久間信晴), and his son was Sakuma Nobuhide (佐久間信秀). Nobumori served under Oda Nobuhide, the head of the Oda clan, and was later treated as the most important retainer of Nobuhide's son, Oda Nobunaga.

Nobumori held the court titles Dewa no Suke (出羽介) and Uemon no Jo (右衛門尉), which marked him as a man of formal rank within the samurai hierarchy. He was active during the Muromachi period (1336–1573), a time of constant military conflict among regional warlords. His life spanned the transition from the old shogunate order to the wars of unification that Nobunaga would drive.

Life and Career

Nobumori's career was defined by his service to Oda Nobunaga, under whose command he fought in every major battle. He participated in the 1567 siege of Inabayama Castle, a pivotal campaign that secured Nobunaga's control over Mino Province. That victory removed a long-standing rival and gave Nobunaga a base for his later advance on Kyoto.

He also took part in the sieges of Nagashima, a fortress complex in Ise Province controlled by the Ikkō-ikki, a league of militant Buddhist monks and farmers. Nobumori fought in the first siege in 1571 and again in the second in 1573. The Nagashima campaigns were brutal and prolonged, and the Oda forces eventually destroyed the fortress and its defenders. Nobumori's presence in these operations placed him at the centre of some of the most difficult fighting of Nobunaga's early consolidation.

Despite his long record of service, Nobumori's standing with Nobunaga deteriorated over time. He was one of the senior retainers who had been with the Oda house since before Nobunaga's rise, and such men were often pushed aside as Nobunaga promoted younger, more aggressive commanders. Nobumori was also involved in the siege of Wakae Castle, a conflict that further tested his relationship with his lord.

Why They Matter

Nobumori matters because he represents the generation of retainers who made Nobunaga's rise possible but were then discarded by him. His participation in the Inabayama and Nagashima campaigns shows that he was a capable and loyal commander, trusted with major operations. Yet his fate illustrates the ruthlessness of Nobunaga's rule: even the most senior and faithful vassals were not safe from dismissal if they failed to meet his standards.

Nobumori's career also highlights the structure of the Oda army. As the most important retainer, he would have commanded significant numbers of troops and held administrative responsibilities over lands granted by his lord. His titles, Dewa no Suke and Uemon no Jo, were formal honours that placed him within the court-ranking system, a sign of the Oda clan's growing legitimacy as it sought to dominate Japan.

The Name in Japanese

The name is written 佐久間信盛 in kanji.

• Kana reading: さくま のぶもり
• Romaji: Sakuma Nobumori

Breakdown of the characters:

• 佐 (sa): meaning "help" or "assistant". In this name it is used phonetically for the "sa" sound and does not carry its literal meaning.
• 久 (ku): meaning "long time" or "long-lasting". Also used phonetically here for the "ku" sound.
• 間 (ma): meaning "interval", "space", or "between". Used phonetically for the "ma" sound. Together, 佐久間 (Sakuma) is the family name, a place-derived surname common among samurai.
• 信 (nobu): meaning "trust", "faith", or "believe". This is the first character of the given name.
• 盛 (mori): meaning "prosper", "flourish", or "vigorous". This completes the given name.

The given name 信盛 (Nobumori) follows a common samurai pattern of combining a character from a lord's name with a second character of the retainer's choosing. The "nobu" character is the same one used in Oda Nobunaga's own name, signalling the bond between lord and vassal.

Legacy

Nobumori's legacy is largely overshadowed by the greater figures of the Oda regime, but his name survives in the records of the campaigns he fought. The siege of Inabayama Castle and the sieges of Nagashima are remembered as turning points in Nobunaga's unification of Japan, and Nobumori was present at both. His dismissal from favour, however, became a cautionary tale among the samurai class about the precarious nature of service to a demanding lord.

His son, Sakuma Nobuhide, carried on the family line, though the Sakuma name never regained the prominence it held under Nobumori. In the broader history of the period, Nobumori stands as an example of the many capable warriors who supported the great unifiers but were themselves forgotten or discarded when their usefulness ended.