I see... had no idea about something like whaleship type and such - and I did check the guide for whaleships on wiki, though I just briefly skimmed over the basics.
So the last two units are dictate the Whaleship unit type. Can the be just any type girls, or should I put the strongest one down there and the weakest on top ?
EDIT: WOOOU ! OK Thanks a lot guys ! With the ship being the proper type the damage dished out onto the boss was ridiculous. Haha Foolish pest ! Today... we had.... our.... VENGANCEEEEE !!!