Naval Warfare WW1: Tsushima Expansion is a exciting addition to your NW:WW1 game. This expansion allows you to play virtually any Russo-Japanese War naval engagment. Ownership of the base game is required. Features: 180+ additional unit data cards! Over 70 new classes of dreadnoughts, pre-dreadnoughts, armored cruisers, light cruisers, destroyers, a seaplane carrier, and torpedo boats! New classes of Russian naval warships and all the major Japanese warships for BOTH WW1 and Russo-Japanese War time frames added! 2 new combat reference charts. 3 new color maps. 12 page rule book. 10 new scenarios covering the most important naval engagements of the Russo-Japanese naval war.