Oda Nobunaga assumed leadership of the Oda clan after the death of his father, Oda Nobuhide, positioning him to pursue the consolidation of Owari Province and later wider unification campaigns.
Nobunaga defeated an Imagawa-linked force at Muraki Castle on the Chita Peninsula, an early success that helped him stabilize Oda positions in eastern Owari against a major regional rival.
By capturing Kiyosu (the provincial capital) from a rival Oda branch, Nobunaga effectively united southern Owari under his authority—an important base for later expansion.
Nobunaga’s surprise attack routed Imagawa Yoshimoto’s much larger army, removing a major threat to Owari and elevating Nobunaga into the front rank of Sengoku-era warlords.
Nobunaga captured the Saitō stronghold of Inabayama Castle and took control of Mino Province, later renaming the site Gifu—creating a strategic platform for moves toward Kyoto.
Nobunaga marched into Kyoto to install Ashikaga Yoshiaki as shōgun, expanding his influence into the political center and marking a major escalation from regional lord to national power-broker.
During Nobunaga’s Echizen campaign against the Asakura, Azai Nagamasa’s reversal forced Nobunaga into a dangerous withdrawal from Kanegasaki—an episode that widened the conflict into a major anti-Oda coalition war.
Nobunaga and Tokugawa Ieyasu defeated the allied Azai and Asakura forces near Lake Biwa, strengthening the Oda–Tokugawa alliance and improving Nobunaga’s position in central Japan.
Nobunaga attacked the militant Tendai complex on Mount Hiei, burning major temple sites tied to his enemies and signaling a harsh approach to autonomous religious-military power near Kyoto.
After Yoshiaki’s revolt, Nobunaga drove him from Kyoto, effectively ending Ashikaga shogunal authority and removing a central institutional rival to Nobunaga’s project of political consolidation.
Nobunaga’s campaign in Echizen culminated in the capture and burning of the Asakura capital at Ichijōdani, eliminating a long-standing opponent and reshaping the balance of power around the Kinai region.
Nobunaga’s forces captured Odani Castle, destroying the Azai—key former allies turned enemies—thereby securing northern Ōmi and easing pressure on approaches to Kyoto.
Nobunaga and Ieyasu defeated Takeda Katsuyori at Nagashino, a battle famous for effective coordinated firearm use and field defenses; it sharply weakened the Takeda and shifted momentum in eastern Japan.
Nobunaga began building Azuchi Castle near Lake Biwa as a major administrative and symbolic center close to Kyoto, reflecting his expanding authority and the emerging style of early modern castle governance.
In the first Kizugawaguchi naval battle, Mōri-aligned forces defeated Oda admiral Kuki Yoshitaka, reopening supply routes to Ishiyama Hongan-ji and prolonging one of Nobunaga’s most difficult sieges.
By 1579 Azuchi Castle’s main works (including the donjon) were complete and Nobunaga moved in, consolidating control over routes and communications around Kyoto from a purpose-built power center.
The main Ikkō-ikki fortress at Ishiyama Hongan-ji surrendered to Nobunaga, ending a major ten-year campaign and removing a persistent religious-military opponent from the Osaka area.
Oda forces under Oda Nobutada stormed Takatō Castle during the 1582 invasion of Takeda territories, one of the final collapses of Takeda defensive positions in Shinano.
Takeda Katsuyori’s last stand ended in defeat at Tenmokuzan, effectively terminating the Takeda as a major power and leaving Nobunaga dominant across much of central Japan.
Mitsuhide’s sudden coup attacked Nobunaga at Honnō-ji in Kyoto; Nobunaga died (commonly described as forced suicide amid the assault), abruptly halting his personal bid to complete unification.
Hashiba (Toyotomi) Hideyoshi quickly defeated Akechi Mitsuhide, avenging Nobunaga and positioning himself to inherit and continue the Oda unification project.
Oda Nobunaga's campaigns for unification (1551–1582)
