Note that Shipyards autoheal themselves, but can't be repaired otherwise. The objective is to destroy the enemy shipyards - as soon as a player's shipyard is destroyed, he's out of the game. You earn money at regular intervals, just as if you occupied a bank, and on maps with banks you can also capture these if you have access to amphibious units that can deploy infantry. (Amphibious ships can however build ground troops, and carriers can build aircraft.) You will start the game with a Shipyard, which can build only naval units. There's no base building or resource management in this mod. opponents trying to destroy your base with hordes of aggressive warships! The Navy Invaders Mod allows you to pit your naval strategic genius against one or more A.I.