 The King of France, Louis XV, made him a Marshal of France for his success in capturing Bergen op Zoom.In 1755 Louis XV gave Lowendal instructions to act as a Plenipotentiary in negotiations with Prussia, designed to prevent the Seven Years' War from breaking out.However Lowendal died before he could carry out his orders and was replaced by Louis Jules Mancini Mazarini, Duc de Nivernais.