In the fort on the side of the mountain, there are 3 levers you need to pull to lower the barrier and drop the anti-dragon shields. Check upstairs, over along the far end wall, by the jewellery merchant; there are a couple levers by the desk, and another by a chest.
In the original release of D2:ED, there was a second barrier later in the fjords that you needed to destroy some ballistas and a nest in order to lower. However, that barrier was removed in DKS.
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