Ota Gyuichi's Shincho-Ko ki (modern translation by Nakagawa Taiko) Introduction book; chapter 35, p. 84.
"Yoshimoto's army came to invade Owari. Nobunaga said, 'This is a serious matter' as he made preparations which he took to heart. The Suruga forces occupied Narumi Castle. On the south side was the Kurosue River which the tides flowed into the bay. Continuing east was the valleys, the west was deep paddies, from the north to east was the mountains. Built ready for use was Fort Tange which was twenty cho from the castle. Mizuno Tatewaki, Yamaguchi Ebi no Jo, Tsutsugen Ban no to, Maki Yojuro, Maki Sojuro, and Ban Ju zaemon were deployed at Tange. The historic ruins from the east was Zenshoji. sakuma Nobumori was placed at stronghold. The south was a small village of Nakajima and here Kajikawa Takahide was deployed. On the opposite side of the Kurosue River were two forts to counter Narumi and Odaka Castles. Sakuma Morishige was deployed at Marune and Io (Ino) Sadamune at Washizu."
My translation is not perfect. However, it will give a clue on Nobunaga's preparations against Imagawa Yoshimoto.
Nobunaga no Tame!