Dive Siren?

Yep they are right, My father used to have an LP record called Aircraft At War and it have various aircraft fly pasts etc, but there was also a section with a Stuka dive bomb attack recorded from the ground so you could hear the sirens. Chilling stuff.

Not sure how to post link so hope this works, the first sounds like an original recording, the second like its from the film Battle of Britain even though it says its original its not

1) http://avanimation.avsupport.com/sound/Stuka.wav

2)

http://www.youtube.com/watch?v=nZZ504TGDpE

Enjoy