Togo is a set of free wargames rules for naval battles during the 1904 – 1905 Russo-Japanese war.
Here’s a set of free wargames rules for the Russo-Japanese war naval battle, Tsushima Strait, complete with printable ships.
“When Technology Meets Tradition” is a set of rules for wargaming early modern warfare conflicts, roughly from 1895-1915. The emphasis of the author is on early World War I (1914-1915) but other period wars are also of interest, such as the Russo-Japanese War or the Boer wars. The rules are fast-play and focus on the problems faced by military tacticians during early modern warfare: when outdated linear tactics and love of the offensive ran head-on into lethal, accurate, and rapid firing weaponry.