Advance Wars 1+2: Mission 10 (Olaf's Sea Strike with Andy)

I believe this was the mission needed to get Olaf to show up for the Final Battle, but I largely avoid it since Olaf's snow harms everyone.

We have a Tcopter we can use to send an infantry over to the enemy HQ if you want, but with some careful planning and a little luck, you can smash his forces and not even need it. The trick is going to be in the first couple turns to hide well enough to get the jump on him and obliterate his navy. From there, you just need to make your way to land and finish off the forces there for a quick and easy win.