According to 'Kamakura Kudaigoki' (a history book in the period of the Northern and Southern Courts to Kamakura period), Motouji stayed at the side of Iruma-gawa River, away from Kamakura, for 6 years to fight against Southern Court.
「鎌倉九代後記」によれば、基氏は約6年間もの長期間、南朝方との戦闘のため鎌倉を離れて入間川沿いに在陣した。