My father was a B-24 pilot.
He once told me of a raid over southern Europe-- they were bombing oilfields in Yugoslavia-- and of all his combat missions this one was the worst when it came to sheer volume of fire. They ran into German fighters on the way in, flak the whole time they were over the target, and then more fighters when they returned to base after the mission.
He said that he got out of his aircraft and started counting holes. There were bullet holes and holes where fragments of antiaircraft artillery exploded near his bird. He lost one engine while over the target.
He told me that he stopped counting at 100 holes. I figured that was the whole aircraft-- 100 holes in the bird altogether. He said that no, that was just the left side of the aircraft from the bomber's position in the nose, and back to just one wing. He never even got to the waist of the aircraft or its empennage before he decided to stop counting.
100 holes. And the way I figure it, that was maybe 1/6th of how many hits that aircraft took.
I think I recall that he said that 20% of the bombers sent out that day were shot down.
Not a game for those whose nerves are made of something less steel.
--R