This is situated in front of the gate of the primary ward (Hon-maru). It is thought as Umadashi Kuruwa (literally horse sallying ward) where warriors get ready to sally forth. While various types of Umadashi are known, it is a separated ward in Nanbata castle. It is encompassed by earthwork so that no one outside can see inside. The route from this ward to the third ward is only via the bridge.
Nanbatajō Museum, Fujimi City Municipal Museum of History and Folklore