In 1940, Rotterdam was subjected to heavy aerial bombardment by the Luftwaffe during the German invasion of the Netherlands during the Second World War. The objective was to support the German troops fighting in the city, break Dutch resistance and force the Dutch army to surrender. Bombing began at the outset of hostilities on 10 May and culminated with the destruction of the entire historic city centre on 14 May, an event sometimes referred to as the Rotterdam Blitz. According to an official list published in 2022, at least 1,150 people were killed, with 711 deaths in the 14 May bombing alone, and 85,000 more were left homeless.

Rotterdam is the second-largest city in the Netherlands after the national capital of Amsterdam. It is in the province of South Holland, part of the North Sea mouth of the Rhine–Meuse–Scheldt delta, via the "New Meuse" inland shipping channel, dug to connect to the Meuse at first and now to the Rhine.