He does a few things which are somewhat easy to avoid.
-He will mostly charge at you, which you must dodge, then you can get a few free shots on him, i used Aard at this point, but im not sure if it helped at all.
-Next he will stand still and call in either a volley of arrows, or a trebuchet barrage, for the arrows you simply need to move away from where you were when he began casting it. For the trebuchet you need to move away from the glowing spots on the ground, i found this pretty hard to avoid since there can be multiple ones and you cannot go near the Draug because he will swipe at you when you approach.
-The last ability is a whirlwind, you can try run away from it, but i never managed to avoid it completely because there was not enough room to move around.
During my first playthrough on normal i was an alchemist, which put me at a huge disadvantage because as far as i know, there is no way to have potions active for this boss due to all the prior events. That meant that i didnt have any of the bonuses from being intoxicated and that i would die in two hits from anything.
I actually had to switch to easy to kill him for this one, which made it many orders of magnitude easier, i suggest doing this because having to do that damned bit beforehand over and over again is hellish (too many of those bloody shieled soldiers).
