Impatient as Philip de la Vallee and Desmond were to get forward, they could not hurry the slow pace at which they travelled.

Mademoiselle Pointdexter was now suffering from the reaction after her month of captivity and anxiety.

The baron therefore travelled with provoking slowness.

Obtaining, as he did, relays of horses at each post, they could without difficulty have travelled at almost double the rate at which they actually proceeded, but stoppages were made at all towns at which comfortable accommodation could be obtained.
Indeed, in some places the roads were so bad that the carriage could not proceed at a pace beyond a walk, without inflicting a terrible jolting upon those within it.
"There is one comfort," Philip said, when he had been bewailing the slowness of their pace, "my men should reach us at Nevers, at the latest, and you may take it as tolerably certain that any attempt to interfere with us will take place considerably south of that town.

I should guess that it would be somewhere between Moulins and Thiers.