Tokugawa Akitake was appointed a second lieutenant in Imperial Japanese Army in 1875, and served as an instructor during the early days of the Imperial Japanese Army Toyama School. He was married to Nakanoin Eiko the same year. In 1876, he was sent to the United States, as the emissary in charge of the Japanese exhibition at the 1876 World Fair in Philadelphia. He then returned to France again for studies accompanied with his brother Tsuchiya Shigenao and half-brother Matsudaira Nobunori. During his eight-year absence from France, the Second French Empire had been replaced by the French Third Republic. From 1881, he ended his studies at the École Polytechnique, but before returning to Japan, he made a tour of Germany, Austria, Switzerland, Italy and Belgium together with his half-nephew Tokugawa Atsuyoshi, the son of the ex-"shōgun" Tokugawa Yoshinobu.