Mail coif Head

Held by a corpse in the grave next to the rock. Bring a Spade to loot it.

2 are inside a chest with an easy-to-pick lock on the ground floor of a building that acts as the Deserters’ camp.

Inside a very-hard-to-pick chest at the top of the watchtower, which itself is locked behind a very-hard-to-pick door. The place will likely be filled with guards, but you’ll hit the motherload if you can get up there!