A German poster designed to be used by Luftwaffe pilots for instruction in attacking, disabling and ultimately shooting down the B-17 Flying Fortress.

Translating the German 'Viermotoriges Kampfflugzeug' (four engine fighter airplane), the B-17 Flying Fortress was now the main target of the German fighter pilots patrolling their Nazi Occupied Europe. The thirteen 50mm machine gun positions on the bomber made it a dangerous adventure for the attacking Luftwaffe. Many planes on both sides went down in intense air battles above German targets and on the way and back from the raids.

The shaded conic and hemispheric shapes indicate areas of fire from the 50mm gunner positions aboard the B-17. Also noted are susceptible locations, specifically the fuel and oil tanks on the Flying Fortress.

Luftwaffe pilots were instructed that the most vulnerable area of a B-17 was the area of the wing between the inboard engines and the fiselage of the ship. The pilots were told to concentrate their fire at that point of the B-17.