Land and Freedom was just released this month and it has a Vassal module too.
Land and Freedom: The Spanish Revolution and Civil War is a 1-3 player semi-cooperative game on the factional infighting, while trying to win the war, in the Republican cause in the Spanish Civil War. One player wins, but only if they work together to beat the game and win the war. Political maneuvering while defeating the Nationalists.
¡No Pasarán!