I am currently on 2/3 for the permadeath on artillery dogs. Not sure which ones counted though as I counted 3 times, twice in cache and once in hoard so maybe its the cache one? I used assassin undead axis gunner to remove immunity and desert rider to inflict permadeath in cache. Used assassin bomber boy and MCR in Hoard and that was the harder one for sure. Hopefully I complete it tomorrow.