Never had a wolf damage or lox climb over my earthen wall. I placed a 2m trench at the base on the side where invasions most often approach. I now have packs of 2 star wolves surrounding my base, (no longer any lox nearby) and I can stand back and watch them wipe out invaders. I try to race and engage if the event is "A Foul Smell From the Swamp" as that is about the only one that can decimate 2 star wolves. 99.9% of the time invaders never get near my walls, because I know the trick is to drop everything and rush out to meet them. Wolf packs outside the walls are deadly and self sustaining. They continually grow in numbers as they kill deer and boar. My base is in a patch of meadow surrounded by Black Forest, built over one of those berry patch villages.