Jean VI d'Aumont, a Marshal of France, made significant contributions to military campaigns during the French Wars of Religion. Although specific details about his role in the defense of Angers were not found, he was known for his campaigns in regions such as Burgundy, Maine, and Brittany. After the assassination of Henri III, he aligned with the Protestant Navarre and led campaigns against opponents like the Duke of Mercœur. His military leadership during this tumultuous period likely influenced various defenses, including potentially that of Angers.
For more detailed information on Jean VI d'Aumont, you can visit his Wikipedia page.