Burke believed the Government was not taking the uprising seriously enough, a view reinforced by a letter he had received from the Prince Charles of France (S.A.R. le comte d'Artois), dated 23 October, requesting that he intercede on behalf of the royalists to the Government. Burke was forced to reply on 6 November: "I am not in His Majesty's Service; or at all consulted in his Affairs". Burke published his Remarks on the Policy of the Allies with Respect to France, begun in October, where he said: "I am sure every thing has shewn us that in this war with France, one Frenchman is worth twenty foreigners. La Vendée is a proof of this".

Answer this question, if possible (if impossible, reply "unanswerable"): When did Prince Charles write to Burke?
23 October