Agreed, i did this fight multiple times as well, with lvl 3 and lvl 4 groups. It's definately winnable, easier when going up the cliff first and surprising the enemy. The wall up there and the planks on the cliff itself are a bit buggy still, like quite a few surfaces in the game at the moment.
I had only minor issues with surprise rounds so far (might have been my own fault :)), sometimes some enemies were surprised while others in the same group were not. But in DnD some monsters cannot be surprised, so might hae been that.
