Postcard of Commodore Perry and Ii Naosuke to mark the 50th anniversary of Yokohama Port's opening in 1909.

Naosuke's attackers overwhelmed his unprepared bodyguards within minutes. Wounded and defenseless Naosuke was further stabbed in his palanquin multiple times until he was dragged out by his topknot and beheaded by a Satsuma rogue samurai.
After the assassination, hard feelings continued between Hikone and Mito. But in 1968, the two cities put the past behind them and became friendship cities. Hikone gave white swans from Hikone Castle, and Mito gave plum blossom trees from the famous Kairakuen Garden.