In April 1941, the German Army invaded Yugoslavia and Greece. The LSSAH and "Das Reich" were attached to separate army Panzer corps. Fritz Klingenberg, a company commander in the "Das Reich", led his men across Yugoslavia to the capital, Belgrade, where a small group in the vanguard accepted the surrender of the city on 13 April. A few days later Yugoslavia surrendered. SS police units immediately began taking hostages and carrying out reprisals, a practice that became common. In some cases, they were joined by the Wehrmacht. Similar to Poland, the war policies of the Nazis in the Balkans resulted in brutal occupation and racist mass murder. Serbia became the second country (after Estonia) declared "Judenfrei" (free of Jews).