The Spanish Civil War at Sea
In summer of 1936 the Spanish Navy was the eighth world naval power, with 2 battleships, 4 cruisers, 15 destroyers and 12 submarines. Following the nation's fate, the Navy was also split in two. War at sea was mostly long and hard convoy warfare blockade, counter-blockade and a few naval surface actions (like the sinking of the Baleares heavy cruiser). Anyway, much like on land, both sides fought with equal valor at sea.
"Mar Rojo" (Red Sea, the name of a merchant ship that was part of both navies) is an exciting, fast-paced card battle wargame for one or two players about the Spanish Civil War at sea.
Each player begins with five cards in hand and a fleet of 5-12 ships. The object of the game is try to sink the enemy warships while your own merchant ships arrive at secure harbour.
—description from the designer