By the latter year he had attained high military rank, and after distinguishing himself at the first Battle of Breitenfeld (1631) he commanded a regiment of foot on the Rhine and defended Rheinfelden against the Swedes with the utmost bravery, surrendering only after enduring a five-months' siege.
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In the following year Mercy opposed the French armies, now under the Great Condé and the Vicomte de Turenne.
Franz Liszt | Johann Wolfgang von Goethe | Franz Schubert | Franz Kafka | Otto von Bismarck | Sisters of Mercy | Alexander von Humboldt | Wernher von Braun | Carl Maria von Weber | Franz Joseph I of Austria | Herbert von Karajan | Franz Ferdinand | Gebhard Leberecht von Blücher | Franz Boas | John von Neumann | Franz Ferdinand (band) | Lars von Trier | Archduke Franz Ferdinand of Austria | Ferdinand von Mueller | Paul von Hindenburg | Alexander von Humboldt Foundation | Heinrich von Kleist | Franz Lehár | Anne Sofie von Otter | Erich von Stroheim | The Sisters of Mercy | Max von Sydow | Justus von Liebig | Franz Josef Land | Hermann von Helmholtz |
A key event was the "Battle of Tuttlingen" on 24 November 1643 in which the entire French army was defeated by the United Imperial-Bavarian troupes under Melchior Graf von Hatzfeldt, Franz von Mercy and Johann von Werth.