Answer: The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force and Fleet Air Arm of the Royal Navy defended the United Kingdom against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces. The British officially recognize the battle's duration as being from 10 July until 31 October 1940, which overlaps the period of large-scale night attacks known as the Blitz, that lasted from 7 September 1940 to 11 May 1941.
The serbs was the ethnic group that was the most brutally to employ the tactic "ethnic cleaning" the murder or forcible removal of ethnic minority from their land.This tactic enabled the force to eliminate civilian support for resistance by eliminating the civilians.
The technologies were only used to observe enemies but as their effectiveness became apparent, both sides started to dismantle what they were using. For example, they shot down the planes that they would see causing more death.