Reports of iconoclasm in Flanders led Charles IX to lend support to the Catholics there; French Huguenots feared a Catholic re-mobilisation against them. Philip II of Spain's reinforcement of the strategic corridor from Italy north along the Rhine added to these fears, and political discontent grew. After Protestant troops unsuccessfully tried to capture and take control of King Charles IX in the Surprise of Meaux, a number of cities, such as La Rochelle, declared themselves for the Huguenot cause. Protesters attacked and massacred Catholic laymen and clergy the following day in Nîmes, in what became known as the "Michelade".