Battlefield Will-o'-WispBattlefield Will-o’-the-Wisp (Classical Form)

A standardized image of the battlefield will-o’-the-wisp as seen in Edo-period picture scrolls and ghost tales. Most appear as multiple pale fireballs at midnight, drifting low as if against the wind. They are thought to rise as spirit-fire from the defilement of blood and corpses saturating the ground, each flame regarded as a fragment of the aura of soldiers and horses. Accounts describe repetitive behavior—circling fixed spots, appearing and vanishing, crossing rice-field ridges—rather than chasing people. Witnesses would recite prayers to withdraw, and villages calmed them with memorial services. Sekien used the term “Kosenjō-bi” to group uncanny fires at battle sites, framing many postwar fire tales found in works like Yadonokigusa. Malice is rarely attributed; they were respected as signs of unsettled souls.