Rov, retrospectology is perhaps one of the more precise "sciences". However, as someone said, "We shall have to kill more of their young men than what they kill our young men." I'm not really dwelling in the past; I was just wondering if people in the UK still remember.
You do, and should, think about those young men in their late teens, early twenties, and older, racing across the tarmac to their airplanes to engage the enemy. But now I feel the same way about the 'enemy': most of those young German guys didn't really want to do it either.