Inoue Kaoru
Inoue Kaoru and Itō Hirobumi returned after only six months in early April 1864 when they received news via Jardine Matheson's London representatives that the Chōshū clan was engaged in direct conflict with Western allied powers over control of the strategic Straits of Shimonoseki. Endo also returned in the later half of 1866 for health reasons. Yamao Yōzō and Inoue Masaru eventually returned to Japan in 1868.