We can do something like to fullfill with all armies:
```Dart
var armies = START_ARMIES[game.players.length];
game.players.keys.forEach((playerId) {
  var countries = groupsOfCountries[i++];
  for(int j = 0; j++; j < armies; j++) {
    _broadcast(new ArmyPlaced()
      ..playerId = playerId
      ..country = countries[j % countries.length]);
  }
});
```