What this song renders
The Heike Monogatari in Book 9 gives this engagement more detail than almost any other Tomoe moment. Variant editions name the warrior as Onda no Hachirō Moroshige or Uchida Ieyoshi; the Genpei Jōsuiki recension uses a third name. Whoever he was, the chronicle agrees that he was a Taira champion of standing, that he sought single combat at Awazu, that Tomoe rode out to meet him, and that she took his head.
The mechanics in the Heike: she rode alongside him, locked his armour at the shoulder, dragged him onto her own saddle-bow, pinned him there until he could not rise, and cut his head off. It is one of the more procedurally specific kills in the chronicle. The choreography is consistent with twelfth-century mounted single combat as it is described elsewhere in the same source.
What the song does with the scene is shift the verdict. The Heike reads the act as proof of skill — the warrior worth a thousand demonstrating the title. The song reads it as duty — this is what it costs to stand where I stand. Both readings rest on the same documented event. The album insists on the second.
The Uchida Ieyoshi engagement is the most-attested single Tomoe action in the historical record — though ‘most-attested’ here means present in one source, the Heike, with variant names across recensions. The choreography is detailed; the warrior is real; the act is the album’s emotional apex of the war.