I visited Japan earlier this year, but forgot to visit Odaka Castle ruins. It was a big mistake. At the moment there is archeological work going at Odaka. My Okehazama colleague Mr. Seishiro Mizuno has written a blog post on the subject. Https://plus.chunichi.co.jp/blog/mizuno/article/233/11009/
Odaka Castle was constructed by Hanai Bitchu no Kami in the years of 1504-21. It measured from east to west approximately 348 feet from north to south 105 feet. The castle consisted of two moats, one outer, and an inner and it was built on a lowland hill. The Hanai and Mizuno families held Odaka in the past before the castle fell in the hands of the Imagawa.
Matsudaira Motoyasu (Tokugawa Ieyasu) brought needed supplies to Odaka during the Battle of Okehazama. Supplies included 450 bags of rice and 110-150 horses.
Tenka no tame!