His eye soon picked out the triangular sails of a sloop, and a blue French naval banner, and, below them on the deck, an assembly of blue-coated soldiers. In case this were not a clear enough message, the sloop now fired a spotty barrage from its collection of swivel-guns. That, MacIan knew, served two ends: it let the Wharf Guard know that these invaders were not a mirage. But it was also a cue to the other actors in the play, letting them know that MacIan had hit his mark, and appeared in a certain window.