Originally posted by GunsForBucks:

What is a sertling castle?
Do you mean goblin tower? Sertlings are the guys on fire that throw fireballs and come from the swamp or ashlands.

Do you still need help?

I would probably build a wood tower on top of a rock or close to the plains <within bow shot> so you can pull the enemies to you bit by bit to kill them off safely.

i get surtlings and goblins- whateveer they're called mixed up