Sentence:  "C'est un garcon de bonne fortune", said the landlord, pointing through the window to half a dozen wenches who had got round about La Fleur, and were most kindly taking their leave of him, as the <WSD>postilion</WSD> was leading out the horses. 
Meaning of the word marked with <WSD> tags:  A rider mounted on the near (left) leading horse who guides the team pulling a carriage.