On what front were 12 million soldiers killed?

Why did some people tolerate the Holocaust? Why did Americans seek to resolve their political disputes through compromise in the early nineteenth century? Which statement least characterizes the significance of Vicksburg? What was the ppe in the 1970s? How do the nahuatl say soldiers? Why did Rudolf hoss go to prison? What statements describes the civil war? What was the value of the capture of Fort Ticonderoga by colonial militia under Benedict Arnold and Ethan Allen? How did the experiences of African Americans serving in the military forces during World War 2 influence their postwar decision? What is a sword hilt made out of? How did Akbar the Great strengthen the Mughal Empire? Which Union soldier rose from obscurity to become a general in the western theater of the Civil War to accepting the surrender of the Army of Northern Virginia at Appomattox Courthouse Virginia.? Was Lincoln Alexander in World War 2? How many british soldiers died in the first year of Afghanistan? For a civil war abc's book what can you put as z? What was the arms reduction? Why did the night of the broken glass happen? What did the north hope to accomplish in the battle of cold harbor? When did the Battle of Bunker Hill start and finish? What is a prisoner of war camp called?

On what front were 12 million soldiers killed?