Top 10 Deadliest Battles in History.

3. Dnieper, 1943 (1.58 million casualties)

In 1943, the Battle of the Dnieper, one of the largest of all World War II operations, was launched, involving as many as 4,000,000 troops between both sides, and stretching across 1,400 kilometers of the Eastern Front. The Red Army managed to recover the eastern bank of the Dnieper River from the German forces (pictured crossing the Dnieper above). The fatal casualties of the battle were as high as 1.58 million, proving this to be one of the costliest battles during World War II.