The sweeping initial victories of Operation Barbarossa produced hundreds of thousands of non-Russian soldier prisoners in the POW cages of the German Army. All of them were hungry, many were starving. In a mere eight months of 1941-42, the invading German armies killed an estimated 2.8 million Soviet POWs through starvation, exposure, and summary execution. Conditions in the prison camps were atrocious. "There were no barracks or permanent housing. The camps were simply open areas fenced off with barbed wire. The prisoners had to lie in the sun, then in mud, and in the fall—with temperatures as low as minus 30 degrees Celsius—faced the possibility of freezing to death."