Because the American Battleship is useless without someone to attack or defend, it is of no immediate importance. Other factors may soon alter this condition, perhaps Japan's Asian factories are lost to the British and the Battleship deters the Japanese from building transports. Understanding the concepts of position and current value will complete your transformation from Beginner to Expert Player. Choosing the Correct Battles I am a firm believer in the attack. However, knowing what you can afford to lose is necessary when making risky attacks.
Tanks are nice, but impotent without infantry.
Several small battles against the odds are better than one big one. Likewise, it is better to defend at the best odds possible in one area and concede areas you cannot defend, unless leaving a token force behind will actually cost the attacker economically or positionally to take. Remember that the retreat option is the most powerful weapon the attacker has, and the one I see new players' use the least. If the attacker has a bad first round in a big battle, they can stop the damage. A player's ability to set up decisive and devastating attacks 2-3 rounds ahead of time, correctly use the ability to retreat, along with a detailed understanding of the economic costs involved in every attack will transform the expert player into master.