chpt 31: #2. why is sir andrew important to this chapter? AND what does he do?

Sir Andrew took the Chauvelin and his men on a wild goose chase......

"Aye! you had forgotten him, hadn't you, m'dear?" said Sir Percy merrily. "Fortunately, I met him, not far from the 'Chat Gris.' before I had that interesting supper party, with my friend Chauvelin. . . . Odd's life! but I have a score to settle with that young reprobate!—but in the meanwhile, I told him of a very long, very circuitous road which Chauvelin's men would never suspect, just about the time when we are ready for him, eh, little woman?"