Coup de Jarnac

Coup de Jarnac

to hit a man while he is down. [Fr. Folklore: Espy, 62]
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References in classic literature ?
But the chevalier believed that his rival had still such strong chances of success that he dealt him this coup de Jarnac with a blade (namely, Suzanne) that was finely tempered for the purpose.
Hence, this summer's cocktail list, with drinks such as the Coup de Jarnac (slang French for a sneaky blow), made with Pineau des Charentes, (a young wine whose fermentation has been stopped by the addition of Cognac) cassis, sparkling wine and Cognac; Bateau Mouche, made with Cognac, Grand Marnier, lime and orange juice; the Angel's Share, made with Cognac, anisette, Cointreau and Kahlua; and the French 75.