Originally posted by Mr B.:

Best defence is just create an ever increasing ring of workbench cover. Events still can't spawn inside workbench areas, but they will come to you so you'll still have to counter any flying event = bats, drakes, gjalls etc.

And obviously, have earth walls to counter land based nasties.

I'd say use balistas, but they are largely proving utterly useless for me.

Tried the workbench “trick”, but soldiers keep coming and destroy the benches.