"Azumakagami" seems to have been compiled after the middle of the Kamakura period and it is difficult to consider this article to be true because it focuses on knowledge on a cavalry battle, but there might have in fact been a basis for generating a heroic episode such as this tale.
『吾妻鏡』の編年が鎌倉時代中期以降とされることからも、この話しは「騎射戦の心得」の伝授に力点があり、事実と断定は出来ないが、しかし物語のような武勇譚が生まれる下地は実際にあったのかもしれない。