There was a famous plot in which it was planned that Masaie NAGATSUKA of Minakuchi-okayama-jo Castle in Omi Province would welcome Ieyasu who had traveled east to conquest Aizu before Sakon and others sneaked into the castle and killed him.
有名なのは近江国水口岡山城の長束正家に、会津征伐で東下する家康をもてなさせ、城内に忍び込んだ左近達が斬るという作戦である。