Bombers of the 20th Century - Vital Guide
At the beginning of World War I a bomber was an ordinary Aeroplane from which small bombs were dropped over the side from an open cockpit.
During World War II they developed into all-weather, day and night fighting machines that bristled with defensive machine-guns and could transport and deliver a 14,000 lb. bomb at a range of 1,000 miles.
By the end of the century, bombers could fly at Mach 2 and some were almost invisible to radar.