Having no idea what to do with hiimself, TAIRA no Sadamori left for Kyoto via Tosando Road in Feburary 938, but was chased by Masakado with his 100 horsemen who feared action from the Imperial Court; Sadamori escaped following a battle at Shinano-gawa River in Shinano Province, although many of his men were killed.
承平8年（938年）2月、身の置き所のなくなった平貞盛は東山道をへて京へ上ろうと出立するが、朝廷に告訴されることを恐れた将門は100騎を率いてこれを追撃、信濃国信濃川で追いついて合戦となり、貞盛側の多くが討たれるも、貞盛は身ひとつで逃亡に成功。