Why was Turenne’s retreat from Mainz to Metz important?

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The premise that Turenne’s retreat from Mainz to Metz was a significant event in his career is based on his early military service during the Thirty Years’ War.

In 1635, Cardinal de Richelieu brought France into open conflict against the Habsburgs. During this period, Turenne served under Cardinal de La Valette on the Rhine. He gained recognition as a hero for his role in the retreat from Mainz to Metz in 1635, an action that helped establish his early reputation as a capable military leader before he went on to achieve greater prominence in later campaigns.1