Return To The River Don is a set of free wargames rules for 15mm miniatures battles set in the Russian Civil War.
Rules: 20th Century
Battle of Tsushima Strait 1905
Here’s a set of free wargames rules for the Russo-Japanese war naval battle, Tsushima Strait, complete with printable ships.
WRG Infantry Action 1925 – 1975 Rules
The classic WRG Infantry Action 1925 – 1975 rules are available free for the downloading. These are the June, 1972 edition of the rules. The link opens a pdf.