Colin must defend two cities with one indivisible regiment of soldiers. His enemy, Rose, plans to attack one city with her indivisible regiment. City I have a value of 10 units, while City II has a value of 5 units. If Rose attacks a defended city, Rose loses the battle and obtains nothing. If Rose attacks an undefended city, she obtains the value of the city, while Colin loses the value of the city. Neither player knows what the other plans to do. Build the payoff matrix and solve the game.