5~10. One or two players for each country. Belgium allies itself with France.
Players put their unit pieces freely on intersection points in their country before the game starts.
Airplane is always put on the capital city.
1, 4
The player can attack one enemy's piece by airplane. If the enemy's piece doesn't have an antiaircraft gun, the unit is annihilated. If the enemy's unit has antiaircraft gun (a black dot is on the bottom of the unit piece), the airplane is captured, and the enemy can use it.
3, 5
The player can move three pieces (attack an enemy's piece, move forward or backward).
When attacking an enemy's piece, the player checks the number on the bottom of each piece, and the piece with the larger number wins. If the numbers are the same, it's a draw. The two pieces go back to each capital city and go into the reserves.
2
The player can put a piece from the reserves to the point broken by enemy's airplane, or can change the position of pieces in their own country.
6
The player can contact an allied country, and can ask them for help (e.g. ask to attack by airplane).