The Namamugi incident , also known as the Kanagawa incident and Richardson affair, was a political crisis that occurred in the Tokugawa Shogunate of Japan during the Bakumatsu on 14 September 1862. Charles Lennox Richardson, a British merchant, was killed by the armed retinue of Shimazu Hisamitsu, the regent of the Satsuma Domain, on a road in Namamugi near Kawasaki.