Apps with 'Battle simulation' feature
Dwarf Fortress is a single-player fantasy simulator with two modes: fortress and adventure.
Total war is a turn based/ RTS strategy game, you play in different historical battles.
Total War: Attila and Medieval II: Total War is also avariable for Linux.
Ultimate Epic Battle Simulator is a sandbox for creating massive battles without limits. Designs battles the way you want, with what you want and where you want.
Free online strategy game.
A multiplayer browser game with players from all over the world, as the game is country based and every citizen of that eWorld is member of a country.