On October 7, Ieyasu and his allies marched along the Tōkaidō, while his son Hidetada went along through Nakasendō with 38,000 soldiers (a battle against Sanada Masayuki in Shinano Province delayed Hidetada's forces, and they did not arrive in time for the main Battle of Sekigahara). On October 20, Ieyasu's Eastern army met Mitsunari's Western army at Sekigahara, and on the following morning the battle began.