I own AI War: Fleet Command, but I think I've only played through the tutorial twice. (It's a victim of my penchant for purchasing games that look interesting and are super cheap, but then end up on the eternal backlog pile) However, today one of the achievements is to lose 30,000 ships in the game.

This doesn't seem hard, considering that losing ships in a game about war should be pretty straightforward, but I have no idea how to do this quickly.

What's the minimal effort way to build and lose a whole bunch of ships? Are there any game modes or map types that make this go quicker?