Bernese forces conquered and ravaged , which belonged to the Duchy of Savoy, which was allied with Charles the Bold. Bern had called out to its Swiss allies for expansion into the Vaud region of Savoy to prevent future aggression by Charles near Bernese lands that were geographically closer to Burgundy than those of the rest of the Swiss Confederation. However, the other Swiss cities had become displeased at the ever-growing expansionist and aggressive Bernese foreign policy and so initially did not support Bern. The Confederacy was a collective defense agreement between the Swiss members and ensured that if one city were attacked, the others would come to its aid. Because the military actions by Bern in Savoy were an invasion, the other Confederacy allies had no legal obligation to come to the aid of the Bernese. In the , the independent republics of the , with the help of Bernese and other confederate forces, drove the Savoyards out of the lower after a victory in the Battle on the Planta in November 1475. In 1476, Charles retaliated and marched to Grandson, which belonged to of Savoy but had recently been taken by the Swiss. There, he had the capitulated garrison hanged or drowned in the lake. When the confederate forces arrived a few days later, Charles was defeated in the Battle of Grandson and was forced to flee the battlefield, leaving behind his artillery and many provisions and valuables. Having rallied his army, he was dealt a devastating blow by the confederates at the Battle of Morat. As Burgundian losses continued, Charles the Bold lost the support of his lords, who were losing men and profit, and a rebellion soon began, led by René II, Duke of Lorraine. As the revolt continued, René used his land's strategic location between northern and southern Burgundy to cut off communication and to disrupt war capabilities. The internal conflict only made the war with the Swiss more difficult and pulled Charles's attention away from the Confederacy to deal with the more pressing matter of René's revolt. Charles the Bold raised a new army but fell during the Battle of Nancy in 1477 in which the Swiss fought alongside an army of René. The military failures of Charles the Bold are summarized by a common contemporary Swiss quote: "Charles the Bold lost his goods at Grandson, his bravery at Morat and his blood at