What about a roleplay, something like the beggining of WW2 (it began in Poland, so first will be Westerplatte, then Warsaw etc.) but it can be artelnate, fictional planes, tanks, other unity, ever soldiers. Then the alliance of Russia and USA, UK, battles in Europe, The Warsaw Uprising in 1944. You can even make the New alliance, like USA and Italy. I'm waiting for your opinions.