Jasenovac concentration camp
In April 1945, as Yugoslav Partisan units neared the camp, the Ustaše guards tried to get rid of evidence of their crimes and the people who knew what they had done.  They tried to kill as many prisoners as possible, as fast as they could.  On April 22, 600 prisoners revolted; 520 were killed and 80 escaped.  Not long after the prisoners revolted, the Ustaše abandoned the camp.  However, first, they killed the prisoners who were still alive.  They also blew up and destroyed the buildings, guardhouses, torture rooms, crematoriums, and other parts of the camp.  When they entered the camp, the Partisans found only ruins, soot, smoke, and dead bodies.