"and in 1943, I was just about everywhere."

Stalingrad, 1943
Creative Commons Attribution Share AlikeStalingrad, 1943 - Credit: Deutsches Bundesarchiv
The total loss of life during World War II is estimated to be around 60 million, the bloodiest conflict in history.

1943 saw particularly heavy casualties, both military and civilian, due to long battles and heavy bombing by German and Allied forces.  These included:

In Russia, the Battles of Stalingrad, Kursk and Moscow.

In the Atlantic, the continued sinking of Allied convoys by German U-Boats.

In North Africa and the Mediterranean, Allied advances in Tunisia and Sicily.

Allied bombing raids on the Ruhr and Hamburg.

In the Pacific, the Battle of Tarawa.

The mass-murder of Jews was in full progress by 1943, with the liquidation of the Warsaw Ghetto and other Polish ghettos that year.

You can find more statistics and information here