Blanche then joined with Emperor Frederick II to besiege the castle of Amance.
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Theobald I, Duke of Lorraine took on Erard's cause, as did his brother-in-law Miles, Seigneur de Noyers, and his nephew André de Pougy, Seigneur de Marolles-sur-Seine and de Saint Valérien.
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On their journey to Le Puy-en-Velay, Erard was arrested by agents of the king of France but managed to escape and get to Champagne.
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