| Rank | Sides | Deaths | Date | War | % Correct |
|---|---|---|---|---|---|
| 1 | Allies vs. Axis | 50-80 Million | 1939-1945 | WWII | 100%
|
| 6 | Triple Entente vs. Central Powers | 15-30 Million | 1914-1918 | WWI | 81%
|
| 15 | South Korea vs. North Korea | 2.5-3.5 Million | 1950-1953 | Korean War | 65%
|
| 9 | Bolsheviks vs. Tsarists | 7-12 Million | 1917-1922 | Russian Civil War | 58%
|
| 13 | French Empire vs. The Coalition | 5-7 Million | 1803-1815 | Napoleonic Wars | 42%
|
| 3 | Qing Dynasty vs. Taiping Heavenly Kingdom | 20-30 Million | 1850-1864 | Taiping Rebellion | 35%
|
| 12 | Communists vs. Kuomintang | 4-9 Million | 1927-1949 | Chinese Civil War | 30%
|
| 2 | Cao Wei vs. Shu Han vs. Eastern Wu | 34 Million | 220-280 | Three Kingdoms War | 28%
|
| 11 | Iberian Christians vs. Iberian Muslims | 7 Million | 718-1492 | The Reconquista | 23%
|
| 7 | Spanish Empire vs. Aztec Empire | 10.5 Million | 1519-1530 | Spanish Conquest of the Aztecs | 12%
|
| 10 | Imperial Alliance vs. Anti-Imperial Alliance | 4-12 Million | 1618-1648 | Thirty Years War | 12%
|
| 4 | Manchu vs. Ming Dynasty | 25 Million | 1618-1683 | Manchu Conquest of China | 7%
|
| 8 | Spanish Empire vs. Inca Empire | 10 Million | 1533-1572 | Spanish Conquest of the Incas | 7%
|
| 5 | Tang Dynasty vs. Yan Dynasty | 13-36 Million | 754-763 | An Lushan Rebellion | 5%
|
| 14 | Spanish Empire vs. Colombian Civilizations | 5.25 Million | 1499-1540 | Spanish Conquest of New Granada | 5%
|