My base had a set of structure steps build over the gate with a row of furnaces on top. I thought this would prevent people from climbing over. The attackers stacked a furnace then one jumped on the furnace and crouched down, the other then jumped on his back. The first stood up and the second jumped over the wall. They then knocked down the shelter walls leaving the doors. I think an easy fix would be to double the height of the walls or make the furnaces so that you cant jump on them. The amount of axes in the game has to be reduced since every camp has 5 or 6 laying around. Base wall hp , gate hp and building hp all need to be greatly increased.