Battle of Ukino
Battle of Ukino was the final victory of Oda Nobunaga in his struggle to unite the province of Owari against his cousin, Oda Nobukata, deputy governor of northern Owari.
Background
After defeating Imagawa clan of Suruga in the battle of Muraki and capturing southern provincial capital of Kiyosu, Oda Nobunaga united the Southern Owari under his rule. In 1555, Saitō Dōsan, Nobunaga's father in law and ally, retired as the lord of Mino Province for his eldest son, Saitō Yoshitatsu. However, on January 4, 1556. Yoshitatsu killed his two brothers, leading to a military conflict with his father. Nobunaga supported Dōsan, but Yoshitatsu defeated and killed Dōsan in battle in April 1556.Seeing the fall of Nobunaga's father in law as an opportunity, Oda Nobuyasu of Iwakura Castle concluded a pact with Yoshitatsu and opened hostilities against Nobunaga.
After resolving internal struggle and rebellion in his own family, defeating his younger brother Oda Nobuyuki who supported by Oda Nobuyasu in the battle of Ino, Nobunaga was firmly established as the ruler of the southern Owari, while the northern part of the province was still the domain of his cousin, Oda Nobukata of Iwakura castle, deputy governor of the northern Owari.
Battle
Mizuno Tadashige was the first to clash with the enemy, breaking through with his spear, and then handed the head over to his brother, Tadatsugu, who took it.Nobunaga with support of his cousin, Oda Nobukiyo of Inuyama, defeated the forces of the Oda Nobukata of Iwakura at Ukino in Owari on August 24, 1558. as result, Oda Nobukata retreat to Iwakura Castle.