First of all, 191st tank battalion company "C" were the liberators of Dachau. That would be if you beleive the prisoners and company "C" as well as company"A" who relieved them. Yes, there was a officer from some ground troops that arrived a long time after, that sent a report in that they were the first. That maybe the report you have seen, but it was later found out the truth and that officer got into some trouble. There are stories of this on the web. The most famous of a boy in the camp who years later tried to find one of those members of the tanks (company"C") that first arrived alone. Plus my dad was in company "C". I also have contact with a member of company "A" who had made it to the Munich airport and setup camp. Later to be told that they had to relieve company "C' who had found a prison camp.