How did Maurice of Saxony and Henry II of France help secure Philip’s release?

Maurice of Saxony and Henry II of France helped secure the release of Philip, Landgrave of Hesse, by leading an unexpected military uprising against the Holy Roman Emperor Charles V in March 1552.1

Maurice, who was Philip’s son-in-law, had grown resentful of the Emperor’s efforts to reintroduce Catholicism into Protestant territories and his failure to honor the guarantee of Philip’s freedom. While commissioned to capture the city of Magdeburg, Maurice utilized the opportunity to raise an army and formed anti-Habsburg alliances with Henry II of France and other German Protestant princes.21

This coalition launched a campaign that overran southern Germany and parts of Austria, forcing the Emperor to flee and ultimately secure the release of both Philip and John Frederick.12