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In page Ferdinand II, Holy Roman Emperor:

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A period of minor operations followed. Perhaps because of Wallenstein's ambiguous conduct, he was assassinated in 1634. Despite Wallenstein's fall, the imperial forces recaptured Regensburg and were victorious in the Battle of Nördlingen (1634). The Swedish army was substantially weakened, and the fear that the power of the Habsburgs would become overwhelming caused France, led by Louis XIII and Cardinal Richelieu, to enter the war on the Protestant side. (Louis's father Henri IV had once been a Huguenot leader.) In 1635, Ferdinand signed his last important act, the Peace of Prague (1635), yet this did not end the war.[citation needed]