Moreover, in the "Shinpen Musashi Fudo Kiko" (a topography of Musashi Province from 1804 to 1829) it is recorded that 'there was a fort in Uwado belonging to Masashige DAIDOJI' and it is presumed that this fort continued to function as an outpost castle after the construction of Kawagoe-jo Castle, and it is believed to have been destroyed at the same time as Kawagoe-jo Castle during the siege of Odawara by Hideyoshi TOYOTOMI.
また、『新編武蔵風土記稿』には「上戸に大道寺政繁の砦があった」と記されており、その砦は河越城築城後も出城として機能していたと推測され、豊臣秀吉の小田原征伐の際に川越城落城とともに廃城となったと考えられる。