[1] After the Revolution broke out, he asked to be naturalized,[2] joined the Girondist club and, under the Legislative Assembly, moved to Paris, where he entered the diplomatic service.

[1] Reinhard's assignment to Moldavia in late 1805-early 1806[1][2] was, according to Romanian historian Neagu Djuvara, unprecedented in that Reihard had occupied the high positions before being dispatched to Iaşi.

[2] Letters addressed by Madame Reihard to her mother, later gathered in a volume, provide detail on the two countries' societies: after they visited Prince Constantine Ypsilantis in his Bucharest residence, the newly renovated Curtea Nouă, she recorded that the palace was unappealing and poorly maintained;[2] amazed that houses in Bucharest lacked writing desks, they were advised to hold writing material on their lap;[2] also according to Christine Reihard, roads in northern Wallachia presented serious challenges to travelers.

[2] Reportedly unbeknown to Consul Reihard,[2] the French Ambassador to the Porte Horace Sébastiani, persuaded Sultan Selim III that Princes Mourousis and Ypsilantis were secretly plotting an alliance with Russia.

[2] This exposed Reihard and his family to risk, and, after the Imperial Russian Army, commanded by Ivan Ivanovich Michelson and Mikhail Andreyevich Miloradovich, stormed into Moldavia, they were arrested.

[2] Upon the family's return to Paris, Charles Reinhard, made a baron of the Empire,[2] was appointed Minister Plenipotentiary to the Kingdom of Westphalia, and, in May 1814, was Head of Chancellery at the French Department of Foreign Affairs (serving until Napoleon's fall and the 1814 Bourbon Restoration).

[1] He kept a low profile during the Hundred Days,[1] and, after King Louis XVIII regained his throne, was made a comte,[1][2] awarded a position in the Conseil d'État, and received the office of Minister Plenipotentiary to the German Confederation in Frankfurt (December 1815 – 1829).