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At intervals from 1793 to 1801 Lang was closely connected with the Prussian statesman Hardenberg, who employed him as his private secretary and archivist, and in 1797 he was present with Hardenberg at the Second Congress of Rastatt as secretary to the legation.
He did not however limit himself to his tasks, and found time, even during the campaign, to translate part of Horace and to compose two poems, the Poème des Alpes and the Chant de guerre - the latter was a condemnation of the murder of the French envoys to the Second Congress of Rastatt.