section_path: Impact/Casualties and war crimes
section_name: Casualties and war crimes
paragraph_text: Casualties and war crimes
  
  Estimates for the total number of casualties in the war vary, because many deaths went unrecorded. Most suggest that some 60 million people died in the war, including about 20 million military personnel and 40 million civilians.
  
  The Soviet Union alone lost around 27 million people during the war, including 8.7 million military and 19 million civilian deaths. A quarter of the total people in the Soviet Union were wounded or killed. Germany sustained 5.3 million military losses, mostly on the Eastern Front and during the final battles in Germany.
  
  An estimated 11 to 17 million civilians died as a direct or as an indirect result of Hitler's racist policies, including mass killing of around 6 million Jews, along with Roma, homosexuals, at least 1.9 million ethnic Poles and millions of other Slavs (including Russians, Ukrainians and Belarusians), and other ethnic and minority groups. Between 1941 and 1945, more than 200,000 ethnic Serbs, along with Roma and Jews, were persecuted and murdered by the Axis-aligned Croatian Ustaše in Yugoslavia. Concurrently, Muslims and Croats were persecuted and killed by Serb nationalist Chetniks, with an estimated 50,000–68,000 victims (of which 41,000 were civilians). Also, more than 100,000 Poles were massacred by the Ukrainian Insurgent Army in the Volhynia massacres, between 1943 and 1945. At the same time, about 10,000–15,000 Ukrainians were killed by the Polish Home Army and other Polish units, in reprisal attacks.
  
  In Asia and the Pacific, the number of people killed by Japanese troops remains contested. According to R.J. Rummel, the Japanese killed between 3 million and more than 10 million people, with the most probable case of almost 6,000,000 people. According to the British historian M. R. D. Foot, civilian deaths are between 10 million and 20 million, whereas Chinese military casualties (killed and wounded) are estimated to be over five million. Other estimates say that up to 30 million people, most of them civilians, were killed. The most infamous Japanese atrocity was the Nanjing Massacre, in which fifty to three hundred thousand Chinese civilians were raped and murdered. Mitsuyoshi Himeta reported that 2.7 million casualties occurred during the Three Alls policy. General Yasuji Okamura implemented the policy in Hebei and Shandong.
  
  Axis forces employed biological and chemical weapons. The Imperial Japanese Army used a variety of such weapons during its invasion and occupation of China (see Unit 731) and in early conflicts against the Soviets. Both the Germans and the Japanese tested such weapons against civilians, and sometimes on prisoners of war.
  
  The Soviet Union was responsible for the Katyn massacre of 22,000 Polish officers, and the imprisonment or execution of hundreds of thousands of political prisoners by the NKVD secret police, along with mass civilian deportations to Siberia, in the Baltic states and eastern Poland annexed by the Red Army. Soviet soldiers committed mass rapes in occupied territories, especially in Germany. The exact number of German women and girls raped by Soviet troops during the war and occupation is uncertain, but historians estimate their numbers are likely in the hundreds of thousands, and possibly as many as two million, while figures for women raped by German soldiers in the Soviet Union go as far as ten million.
  
  The mass bombing of cities in Europe and Asia has often been called a war crime, although no positive or specific customary international humanitarian law with respect to aerial warfare existed before or during World War II. The USAAF bombed a total of 67 Japanese cities, killing 393,000 civilians, including the atomic bombings of Hiroshima and Nagasaki, and destroying 65% of built-up areas.