Could be free for all fight, or in teams. All participant choose a modern nation, and fight using their forces. These include basic military branches such as; Army, Navy, Airforce, Special Forces, and other minor sub-branches. Participants would also need to create a profile for that E-war, displaying chosen country, and all units involved.
Could possibly make a system for devising what armies you have access to. Terrain could be voted on prior to, or chosen by Admin. Objectives could be hold area/position, completely destroy enemy, kill a commander, or destroy all naval, air, or ground support of a nation.