Was d-day the deadliest day in World War 2?

Answer 1

Not really even close. On four of the five beaches casualties were relatively light. It was only on the US Omaha Beach that there was hard fighting, and it involved only two US divisions, plus supporting units. There were many worse days for Americans, and far more a great deal worse for Russians, Germans and Japanese. If you include civilian deaths, there were the two nuclear attacks on Japan, and even those were not as deadly as the great fire raid on Tokyo in March, 1945, where 130,000 Japanese were incinerated in a single night, or the firestorm created in Hamburg, which killed upwards of 50,000, but no one will ever be able to say how many exactly. As the war was ending in Europe a Russian sub sank the passenger liner Wilhelm Gustlof in the Baltic, which was packed with at least 12,500 refugees fleeing in front of the Red Army, plus a couple of thousand wounded German soldiers. Very, very few survived.