You need a subscription and a decent PC to play but Battleground Europe is one of the best PC games I have ever played.   It's an incredible game, which I have been playing for over 5 years now - it's that good.  It's played on a scaled map of Europe, you can play allied or Axis , infantry, air force, tanks or artillery - the map is huge - it would literally take you days to travel across it in real time on foot!