During this battle, Junkei TSUTSUI, a Sengoku daimyo (Japanese territorial lord in the Sengoku period), who was asked for support by both AKECHI and HASHIBA (TOYOTOMI), once took the side of Akechi and advanced to Horaga-toge Pass, which was located at south of Yamazaki.
この時、明智・羽柴の双方から加勢を依頼された大和国の戦国大名筒井順慶は、一度は明智側に従って山崎の南方にある洞ヶ峠まで兵を進めた。