What role did the Duchess de Longueville play in Turenne’s involvement in the Fronde?

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Turenne, Henri de La Tour d'Auvergne, vicomte de — Henri de La Tour d’Auvergne, vicomte de Turenne Henri de La Tour d'Auvergne, vicomte de Turenne, engraving by Robert Nanteuil, 1665; in the National Gallery of Art, Washington, D.C.

The Duchess de Longueville, sister of the Great Condé, played a pivotal role in drawing Turenne into the Fronde, an aristocratic rebellion against Cardinal Mazarin.12

Her influence on Turenne manifested in two key stages:

First Fronde: Turenne’s friendship with the Duchess and his family’s interests led him to intervene on the side of the rebels during the first war of the Fronde.1
Second Fronde: After Mazarin arrested Condé in 1650, Turenne fled and joined the Duchess at Stenay on the eastern border of Champagne. The Duchess was instrumental in this phase, as she played the most prominent role in attracting both Condé and Turenne to the rebel cause. Together, they formed a treaty with the Spanish—who were then at war with France—and waged military campaigns in Champagne until Turenne’s defeat at the Battle of Rethel.12

Ultimately, Turenne’s involvement with the Duchess and the rebel faction ended after he returned to Paris in 1651, eventually shifting his allegiance to serve the monarchy.1