The Crossing of the Somme took place on 5 August 1636 during the Thirty Years' War and the Franco-Spanish War when units of the Spanish Army of Flanders and the Imperial Army under Thomas Francis, Prince of Carignano, lieutenant of the Cardinal-Infante Ferdinand of Austria, crossed the Somme river near Bray-sur-Somme during its offensive in French territory. Despite the fierce resistance of the French army led by Louis de Bourbon, Count of Soissons, the allied troops successfully crossed the river and drove off the French troops along the Oise river, proceeding over the following weeks to invest the important fortress of Corbie, located two leagues upriver of Amiens, which caused a spread of panic among the population of Paris.