an Imperial-Spanish army under Count Piccolomini destroyed the main French army in the south at the Battle of Thionville. In 1640, Dutch attacks on Hulst and Bruges were repelled by the local Spanish garrisons. In the south, after a failed attack on the Spanish fortress of Charlemont in Givet, the French army launched a great offensive upon Arras, the capital of the County of Artois. Ferdinand took the command of the army and attempted unsuccessfully to break the French lines. The city finally surrendered on 9 August. Its capture was the first victory of importance for the French in the war after five years of fighting. Fall from grace More dangerous than his military enemies were, however, his enemies at the Spanish court. Numerous rumours and lies floated about, and it was claimed that Ferdinand was planning to become an independent ruler of the Spanish Netherlands with the help of the French King, an enemy of Spain. This rumour was enhanced by another rumour that the French court was planning to marry Ferdinand to Anne Marie Louise d'Orléans, Duchess of Montpensier, the (eldest) daughter of Gaston, Duke of Orléans, the French king's brother. The former claim was untrue however his sister Anne of Austria did suggest a marriage between Ferdinand and Anne Marie Louise, the greatest heiress in Europe. Making matters worse, the Spanish empire was under intense pressure militarily and financially; the Cardinal-Infante was even given conflicting orders to send troops to Spain to aid against the 1640 Portuguese uprising. Death Ferdinand fell ill during battles in 1641, and died on 9 November 1641 in Brussels at age 32. It was thought that death was caused by exhaustion combined with ill health. Reports talk about a stomach ulcer, but rumors also claimed that he was poisoned. Before his death he had an illegitimate daughter, Marie Anne de la Croix, born in Brussels in 1641 and died a nun in Madrid in 1715. His body was brought to Spain in 1643, and 12,000 requiem Masses were performed in accordance with his last wishes. He was buried in the Panteón de Infantes. Disputes about his successor as the Governor-General of the Spanish Netherlands destroyed the alliance between the Emperor in Vienna and the Spanish in Madrid. The Emperor (by now the Cardinal-Infante's old comrade in arms, Ferdinand III) favored his brother Archduke Leopold Wilhelm of Austria, a militarily unfortunate but otherwise