Jasenovac concentration camp
As the war went on, German generals wrote reports on the number of Serbs, Jews, and others killed in the Independent State of Croatia.  In 1943, three different generals estimated that 300,000 to 400,000 Serbs had been killed.  By March 1944, Ernst Fick wrote that 600,000 to 700,000 Serbs had been killed. Hermann Neubacher wrote: