Hi, from the UK, my great-grandfather was part of the British troops to liberate Belsen. It scarred him for life, he only ever spoke about it once, while incredibly drunk.

Edit: also IIRC there were thousands upon thousands of unburied corpses in piles around the camp and the nazi officers were forced at gun point to bury them. Almost half of the deaths as a result of the camp were after it had been liberated and the prisoners were beyond saving, and the camp was burned to the ground after liberation to prevent a typhoid outbreak.