During World War Ii, The Nations Of Experienced The Most Casualties, Both Military And Civilian. Overall, Made Up The Largest Percentage Of Casualties Worldwide.. Overall, made up the largest percentage of casualties worldwide. During world war ii, the nations of china and the soviet union experienced the most casualties, both military and civilian.

Thus, 12,000 belgian soldiers and 17,000 dutch military lost their lives between 1940 and 1945. During world war ii, the nations of china and the soviet union experienced the most casualties, both military and civilian. Overall, made up the largest percentage of casualties worldwide.