[Agema]

Rlyeh have amphibious troops, as good underwater as on land.

Take a look at the pictures below the statistics on units, use the cursor on them to see what they do. There can be a cyan lizard type thing with a tail curling round that means the unit is amphibious. There's a fish, which means it's aquatic and can't go on land. The other one is a green frog, which means poor amphibian - although it can enter sea as well as go on land without an item, it will take penalties underwater.

I've not tested polymorphIf the pigs still have an ampihibious symbol from their prior incarnation as a sea beastie, they'll be fine after the fight. If not, they'll probably drown after the battle is over.