What did prussians say they would do if any member of the royal family was harmed

They would destroy Paris

Explanation:

Following the commencement of the French Revolution in Paris, France in 1789. The Prussian government under the command of Field Marshal Gebhard Leberecht von Blücher threatened to destroy Paris if and when the royal families are harmed.

This declaration eventually aggravated the anger of the masses, as they immediately murdered the royal guards and imprisoned King Louis, Marie Antoinette, and their children

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