RUSSIA (campaign of). - DARU (Pierre). Letter and document signed as Minister Secretary of State, addressed to the Grand Chamberlain Élisabeth-Pierre de Montesquiou-Fezensac. Moscow, September 1812. - NAPOLEON I. Handwritten document, in copy signed by Pierre Daru. Moscow, 23 September 1812. "Napoleon, Emperor of the French [...]; We have decreed and decree the following... Captain Chasteignier, former aide-de-camp to the late Major General Caulaincourt [Auguste-Jean-Gabriel de Caulaincourt, brother of the Duc de Vicence, who had just fallen at the battle of La Moskova], is appointed one of our executive officers...". (one p. folio, dry stamp with Napoleon I's coat of arms; upper margin slightly faded). - Daru (Pierre). Signed letter. Moscow, 26th September 1812. Letter accompanying the dispatch of the above piece (1/2 p. folio).