 Complete the following phrase:  However, subsequent conflicts would largely discredit Douhets theory. Air Marshal Arthur Bomber Harris set out in 1942 to prove Douhets theories valid during World War II. Through four years under his command, RAF Bomber Command attempted to destroy the main German cities. By 19441945, in partial concert with the USAAF, they had largely achieved this aim; but no revolution toppled the Third Reich. The heavy bombers involved in the 