Following the Huguenot defeat on 16 March 1569 at the Battle of Jarnac Jeanne's brother-in-law, Louis I de Bourbon, Prince de Condé was captured and subsequently executed. Gaspard de Coligny assumed command of the Huguenot forces nominally on behalf of her son Henry and Condé's son, Henri I de Bourbon, Prince de Condé. Jeanne established a loan of 20,000 "livres" from England, using her jewels as security, for the Huguenot cause.