Posted from another forum:

Originally Posted by A Dapper Walrus
Okay, playing a naval battle which I technically have won (my ironclads beat their actual battleships or whatever). However, I cannot shoot down the shamans leading to an eternal stalemate. Is there any way to end this?


Oops, it seems that this possibility wasn't taken into account, and because you can't spawn a Dragon on a sea map at the moment, there's no way to end it. Ironclads can't hit Shamans with their mines.