A historical character, Wilson is a U.S. Senator from Massachusetts. "Editor" George MacDonald Fraser notes in Endnote 43 that narrator Sir Harry Flashman never names the fat senator who plays a role in trying to recruit him for the mission to thwart John Brown, but the physical description and confrontation at a Boston hotel indicate Wilson. When Brown asks about speeches that the senator has given against his recent foray into Missouri, Wilson declares that such illegal acts do harm to the anti-slavery cause. Brown disagrees and they part. Flashy passes a note to his handler, Messervy, via Wilson but does not know if he receives it or if it has any effect on the defense of Harper's Ferry.