The night of 4/5 September 1944 (Page 84)

A rare reference to NSG 9's impact on Allied ground troops can be found in "The Gothic Line: Canada's Climactic World War II Triumph in Italy" by Mark Zuehlke (Douglas &McIntyre, Vancouver, 2003).

Recommending this book highly, reviewer Bill Stone wrote:

...there's scarcely a mention of air support until the night of 4-5 September [1944]. Surprisingly, it was not an Allied operation. The Luftwaffe sent a few raiders over the Canadians and caused disruption far in excess of their numbers and the actual physical destruction.

ULTRA and NSG 9: September 1944

By Autumn 1944, the number of ULTRA messages intercepted about the Luftwaffe in Italy had declined sharply and a researcher can spend a lot of time searching but come up with comparatively little. Consequently those chapters of "Ghost Bombers" relied more on other sources.

These pages list some messages either not used or not cited in "Ghost Bombers." Mostly they are signals that came to light during research into the September-November period for a later project. They amplify what appeared in the book but don't invalidate anything there, as far as I'm aware.

Link to ULTRA glossary

9 September 1944

XL 9699
Luftflotte 2 sorties ... (b) on 9th, 38 sorties by 19 GA aircraft and attacks on localities and road traffic east and west sectors.

10 September 1944

XL 9802
GAFCIT report late 10th: 35 NGA sorties road strafing eastern front area and Lucca (comment: presumably night 9/10th) ...

11 September 1944

XL 9942
... (b) GAFCIT report late 11th: 20 sorties by 17 Ju 87 (comment: presumably night 10/11th)

12 September 1944

XL 9987
ZZZ
GAFIT evening 12th ... night G/A ops cancelled until further notice. Ops in new moon period would be notified in good time.
130321Z/9/44

23 September 1944

HP 1103
According GAFIT late on 23rd: NGA ops were to be expected from Verona area from 26th.