Even after Kenshin's death, the Uesugi army was so strong that it was rumored in the area ruled by Nobunaga ODA that 'both the Takeda army and the Uesugi army had unrivaled strength in the nation' (refer to the article of March in the Tensho era (April 1582) in Yamato no kuni Kofuku-ji Renjo-in kiroku (the records of Kofuku-ji Temple and Renjo-in Temple).
上杉軍の強さは、謙信の死後も、織田信長の支配地域において｢武田軍と上杉軍の強さは天下一である」と噂されるほどのものであった（大和国興福寺蓮成院記録・天正十年三月の項を参照）。