If you have trouble with a visual bug of water, go in the PR2 folder and use the PR2config file to check the compatibility mode for reflection. You can choose too to uncheck both reflections to get a flat sea.
You can only control 1 ship, one-by-one, no matter how many warships you set. Yes 1 ship against a whole coastal defense. Also the production chain only has 1 input comparing to PR1.
https://www.youtube.com/watch?v=IYPMlEQ6JJU
Also the production chain only has 1 input comparing to PR1.
How could you win without only one ship?