The country that saw constant bombing of their cities by the German air force beginning in 1940 was Great Britain. This period of intense bombing raids is known as the Blitz, which lasted from September 1940 to May 1941 during World War II. The German Luftwaffe targeted British cities, including London, Coventry, and Birmingham, in an effort to weaken the morale of the British people and prepare for a potential invasion. The resilience and determination of the British population during this challenging time played a crucial role in eventually repelling the German forces.