There is a lot of evidence that the Nazi's had flying saucers.  They
were believed to have 'death ray' weapons onboard.  There is
speculation that they were unmanned robotic electromagnetic aircraft.
That 'Foo Fighters', without obvious means of propulsion, buzzed our
planes in WWII is fact.

why did they loose the war ?
with such weapons every plane could be shot down...
or is there also a wonderfull explanation for that?