A discering eye will notice that the princesses are standing on the ramparts of the castle, along with a few attendants (notably the king and prince, who are unarmed I believe, and the Wizard, who appears to be busy in the tower.) All the knights, even a few star wars figures, are laying on their sides, which, in child play language you know means they're DEAD!
What have the princesses done?? The carnage! It's almost too much to bear for poor Mulan and Snow White, who have to avert their gaze while Pocahontas and Belle man the catapult.
Well, I say it's about time they staged a revolt. Those poor princesses were trapped in the brig of the pirate ship *one* time too many!