Originally posted by Zep Tepi:

Put workbenches around your base to prevent spawning inside your moat. I usually carry a small beam blueprint around so it will show me the craft radius. That way I can make sure there are no spots that aren't covered. After I have the whole area covered, I replace the workbenches that I don't want with campfires. Campfires will do the same thing, but they're less likely to get broken when the mobs throw things. They don't have to be lit to work.

As for the current raid, you have to be inside the red circle for two minutes to get it to end. Run around as much as you want, but stay inside the circle. Since the trolls are inside the moat, you can sprint jump across (if it's only one square wide) or down one side and up the other. The trolls can't follow you across it, assuming there is still space inside the red circle for you to be on the outside. Then you can finish them off with a bow when the raid ends. That's what the moat is for after all.

I Had work benches all around, This is my 2nd playthrough now, Its funny the area inside the mote wasnt very big after i extended my base and the trolls couldnt escape even when the raid was over.
My mistake was to plant trees about 20 of them around the base, so each troll then picked up a tree. I will try and upload a screen shot of the damage its a mess.
Even though i was mad at the time and my heart sunk after spending most of the day/week making everything look pretty inside, i look back at it and think i will just build back bigger and better i did not loose anything it was just all on the ground, every chest was smashed open. Took me around a hour and a half to just get lucky enough to grab my stuff and food then i could kill the trolls. Only died about 35 times remaining alive for around 2-4 seconds each time. Got a bit made when my bed broke i had a long run each time then.