(archaic) A truncheon or staff carried by a king or commander, used to signal commands.
1595, Samuel Daniel, Civil Wars, in The Poetical Works of Mr. Samuel Daniel, Volume II, London: R. Gosling, 1718, Book I, stanza 62, p. 25,
When, lo! the king chang’d suddenly his Mind,
Casts down his Warder to arrest them there;