A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Unless stated otherwise, all information herein is taken from Towers of Midnight, Chapter 47.
Villiam Bloodletter was a commander that lived long ago. He once fought against the Banath People on the place that now is known as the Almoth Plain. He painted a few of his soldiers red, which made the Banath people think that those soldiers were the leaders of Villiam's army since they always painted their own leaders red. The Banath people then hunted Villiam's painted soldiers, while Villiam's archers shot their leaders. This is told in The Song of a Hundred Days.