Although the Italian Wars (1494–1559) came to dominate the reign of Francis I, the wars were not the sole focus of his policies. Francis merely continued the incessant wars that his predecessors had started and that his successors on the throne of France would drag on after Francis' death. Indeed, the Italian Wars had begun when Milan sent a plea to King Charles VIII of France for protection against the aggressive actions of the King of Naples. Militarily and diplomatically, Francis' reign was a mixed bag of success and failure. Francis tried and failed to become Holy Roman Emperor at the Imperial election of 1519. However, there were also temporary victories, such as in the portion of the Italian Wars called the War of the League of Cambrai (1508–1516) and, more specifically, to the final stage of that war, which history refers to simply as "Francis' First Italian War" (1515–1516), when Francis routed the combined forces of the Papal States and the Old Swiss Confederacy at Marignano on 13–15 September 1515. This victory at Marignano allowed Francis to capture the Italian city-state of Milan. Later, in November 1521, during the Four Years' War (1521–1526) and facing the advancing Imperial forces of the Holy Roman Empire and open revolt within Milan, Francis was forced to abandon Milan, thus, cancelling the triumph at Marignano.