Russian Front, a huge hex-based strategy battler set during World War II, is developed by Hunted Cow Studios Ltd. It was released on Google Play last month, priced at $9.99
In this game can play an entire campaign from 1941 to 1945, spread across 108 turns and including all of the action on the Eastern Front from the German invasion to the Soviet push to Berlin. That's a lot of historical turn-based battling.
The game also features some more bite-sized campaign modes if players don't want to commit to playing almost half a decade's worth of conflicts. The game has a seasonal weather pattern that will affect the tactics you can employ in battle. The bitter cold means that cutting off supply lines can be a critical attack.
Now players can download it for free for their Android to have a try: http://bit.ly/1vBdxfA