Turenne began the 1645 campaign with a successful forward movement, but Mercy managed to deceive him into thinking the Bavarians were scattered and far away and he was taken by surprise and defeated at Mergentheim. While Turenne had quickly ordered his forces to unite one of his subordinates, general Rosen, was not informed on the situation, defied the order, leading to defeat while Turenne's main force was winning. Turenne's army lost all of its artillery and baggage and five sixths of its infantry. Turenne retreated to Hesse, which caused its forces to join the French, while a Swedish force and reinforcements under Condé, who took command once again. The Swedes soon departed, but Enghien commanded still 17,000 men. The French marched into Bavaria with facing little opposition until they caught up with Mercy's retreating army. Mercy inflicted casualties of the French in an artillery duel and outmaneuvered them in the march on Allerheim, buying time to fortify his position. Turenne advised not to fight but this was rejected by Condé. Turenne's plan of attack was accepted by Condé. The following battle was a French victory and Mercy was killed but the French had suffered heavily. Ill-health forced Enghien to retire soon afterwards, leaving Turenne for the third time in command of the French army. He was met by superior imperial forces and forced to retreat. At Philippsburg Turenne crossed the Rhine using a bridge made of boats.