However, Mitsuhide AKECHI who was ordered by Nobunaga ODA to take over Tanba conquered Yokoyama-jo Castle in August 1579, and Nobufusa SHIOMI, its steward, killed himself, which brought about the end of the rule of Fukuchiyama under the Shiomi clan.
しかし1579年（天正7年）8月に織田信長に丹波平定を命ぜられた明智光秀は横山城を攻め落とし、城主の塩見信房は自害し果て、塩見氏の福知山統治は終焉することになる。