What this song renders
Herodotus calls it the fiercest battle ever fought between non-Greeks (1.214). After Cyrus crossed the Jaxartes to invade Massagetae territory, took Spargapises by a baited camp of wine, and lost the boy to suicide in captivity, Tomyris gathered her full strength and met the Persian army in the open. In his telling the two sides first fought at distance with bows, then closed with spear and the short steppe sword until the Massagetae prevailed and the greater part of the Persian army was destroyed on the field. Cyrus himself fell, after a reign of twenty-nine years.
The track renders that collision as its structural peak: the cold address at the river, the cavalry coming off the bank ‘like the year’s first flood,’ the empire’s tight line holding for a moment and then breaking. The detail that Cyrus crossed the river to invade — and that the river became the boundary he could not recross — is the spine of the lyric; the river is named only in the title, never sung, so the hook can stay on ‘the water’ and ‘the river-stones.’
What history does not give is certainty. Herodotus himself notes that many stories were told of Cyrus’ death and that he reports the one he found most credible (1.214). Cyrus dying in battle against the Massagetae is the dominant ancient account, but it is not the only one, and no contemporary record confirms it. The song commits to Herodotus’ version — the conqueror killed on the steppe by the woman whose son he took — while withholding the act itself: the kill is camera-withdrawn here and only implied, the way the field is left at the kneel and the single word.
Cyrus’ death in battle against Tomyris at the Jaxartes is the dominant ancient account (Herodotus 1.211–214) but not the only one — Herodotus flags competing versions and reports the most credible. The fierceness, the bow-then-blade sequence, and the Persian rout are as he tells them; the specific kill is dramatized, not documented. See Truth & Legend.