On May 24, 1863 (Bunkyu 3), several buildings of the American legation at the Buddhist temple Zenpukuji in Edo (current Tokyo) were burned down by anti-Western samurai of the Mito Clan. This prompted the US Minister to Japan, Robert Hewson Pruyn, successor of US Consul Townsend Harris, to move to Yokohama.
Zenpukuji had became the home of the first American legation in Edo in 1859 (Ansei 6).