I got a great artist and I culture bombed the Oil after I defeated Japan. As I am building Oil well on it currently, I am planning my invasion against China. According to demographs, china has better army than me. No manhattan project has been completed yet. Here is the status: http://www.upload.ee/image/1408363/naval_invasion.png Should I build some battleships to be clear from her navy or submarines? If you look closely, she has a carrier with three aircrafts and two cities have aircrafts in them. What is the best bet to fight air while doing a naval invasion?