[Bill Walker]

No, I haven't read all nine sections, but I have scanned them, and read a few other books on the subject. Your attachment shows a line of defence that was developed after Bomber Command night raids began in earnest. Did the Germans start the war with anything similar to the combination of the Observers Corp and the Fighter Command filter centres that tracked aircraft (friendly and hostile) after they penetrated perimeter defences like this? All I have ever read about is small scale local systems, that often left defensive aircraft on the ground in one area while neighbouring areas were flooded with Bomber Command aircraft. The whole idea behind large scale RAF raids, like the 1000 bomber raids, was to locally overwhelm the German defences.

The UK was at a real advantage here, in terms of the area to be covered (the island of Great Britain), while the Germans had a much larger area to cover after this western line had been passed. I still haven't seen anything that tells me the Germans had a wide area command and control network, similar to the UK system in place before the war began, until very late in the war.