The 13th Division was an infantry division in the Imperial Japanese Army. Its tsūshōgō code name was the Mirror Division , and its military symbol was 13D. The 13th Division was one of four new infantry divisions raised by the Imperial Japanese Army (IJA) in the closing stages of the Russo-Japanese War 1 April 1905, after it turned out what the entire IJA was committed to combat in Manchuria, leaving not a single division to guard the Japanese home islands from attack.

Jōetsu is a city located in Niigata Prefecture, Japan. As of 1 December 2020, the city had an estimated population of 189,430, in 76,461 households with a population density of 190 persons per km2. The total area of the city was 973.81 square kilometres (375.99 sq mi). Jōetsu borders the Sea of Japan and is renowned for its abundance of snow, the annual cherry-blossom festival, sake and Koshihikari rice.