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Sauvignon was dispatched to spy on the Dover covert and met two of the sick dragons. To protect the secret of the Dragon Plague, William Laurence asked Temeraire to use the Divine wind on her. Temeraire spared her life by roaring above her head instead of directly targeting her, but she tumbled into the sand pit where the Longwings were quarantined.
She and Temeraire were forced into quarantine together. She began to show symptoms of the disease four days later, while Temeraire remained healthy. Later, Admiral Nelson, Lord Mulgrave and Admiral Gambier hoped to deliberately infect all the dragons of the Armee de l’Air by allowing the ailing Sauvignon to return to France.
The British Aerial Corps thought it terrible to knowingly spread the plague to Europe, and worried that Napoleon Bonaparte would then attempt to cross the Channel and invade England before the French dragons were significantly compromised.