From the application's "About" file
This game is a classic hex and counter wargame converted for Android, covering the Axis invasion of Yugoslavia in 1941.
A game for two players on Axis player and one Yugoslav player. Alternatively, one player may play either side, while the computer plays the opposition.
The playing area is a map of Yugoslavia and surrounding areas split into hexes, which control movement and ownership of terrain.
The objective of the Axis player is to capture the five cities: Zagreb, Sarajevo, Dubrovnik, Skopje and Belgrade as quickly as possible. The Yugoslav player must stop them.