Hosokawa had always worked closely with the "shōgun"s brother Ashikaga Yoshimi, and supported his claim to the shogunate. Yamana took this as an opportunity to oppose Hosokawa further, supporting the child as heir to the shogunate. War broke out in the city of Kyoto. This was regarded by the Ashikaga "shōgun" as an act of rebellion, and thus the Ashikaga and their supporters were forced to try to stop it. The Ashikagas tried to prevent the outbreak of war over the next heir, but the situation escalated into a war that designated the leader of the victorious party as the next "shōgun". In 1467 the uncertainty had caused a split amongst the warrior clans, and the succession dispute became a pretext for a struggle for military supremacy. In the end, there was no clear-cut winner. The complex array of factional armies simply fought themselves into exhaustion.