David Lesher wrote:

nt (Krztalizer) writes:

They built "Rotterdam" / H2S duplicates as well.

H2S was forbidden over land for quite a while. It was vital to the
Uboat campaign and the boffins figured that if used over Germany,
one *would* be captured and the secret blown. [There was no way to
destroy the magnatron w/o taking out the aircraft as well....]

That argument was made by the RN/Coastal Command, but Bomber Command
won the decision (by Churchill), and H2S went into service over land
right away. And a more or less intact magnetron was captured on one of
the very first missions, from a Stirling shot down near/over Rotterdam
(whence its German code name, Rotterdam Gerate) on 2 February 1943.

Guy