public static bool IsDefensiveArmy(CommandArmy army) =>
 army.Spear > 2000 || army.Sword > 2000;
 public static bool IsDefensive(this CommandArmy army) => IsDefensiveArmy(army);
 public static bool IsOffensiveArmy(CommandArmy army) =>
 army.Axe > 1000 || army.Light > 400;