He was also one of those responsible for Mass murders in Piaśnica, where approximately 12,000 Poles and Kashub intelligentsia were killed in 1939-1940.
====Piaśnica====Forster was one of those responsible for the mass murders in Piaśnica, where approximately 12,000 to 16,000 Poles, Jews, Czechs and Germans were killed in the winter of 1939-1940.