8th USAF

[Haza]

 

https://www.dailymail.co.uk/news/article-7167249/Incredible-restored-footage-WWII-bombers-crews-carrying-raids-Nazi-Germany.html

 

"After examining wrecked B-17s and B-24s, Luftwaffe officers discovered that on average it took about 20 hits with 20 mm shells fired from the rear to bring them down". 

 

Although it took 50 hits with 20mm to bring down a Pe-2 (OK, last sentence is tongue and cheek!!)

 

regards