The Siege of Mount Hiei refers to the 1571 military campaign led by Oda Nobunaga against the powerful Tendai Buddhist monastery located on Mount Hiei, near Kyoto. This event highlights the intense power struggles during the Sengoku period, where rival daimyลs sought to consolidate control over their territories and eliminate potential threats to their rule. The siege resulted in the destruction of the monastery and exemplified Nobunaga's ruthless tactics in his quest for unification of Japan.