In attacking enemy tanks at close quarters with Molotov cocktails or
incendiaries, the air intakes are among the most vulnerable points. It is
important, therefore, that the location of these intakes and outlets be known, as
the flame and fumes of a grenade thrown against an intake while the engine is
running will be sucked inside, but if the grenade lands on an outlet, they will be
blown clear of the tank.
The best targets are the flat top-plates behind the turret. Side intakes
are invariably protected by a vertical baffle. The accompanying sketches show
the "soft spots" in German tanks Pz.Kw. 2, 3, and 4.