The visibility problem was precisely why 'precision bombing' in the truest sense was frequently not achieved in Europe.For their most successful raids, eg the Focke-Wulf factory etc, the 8th AF had to go in low, certainly 15,000ft or less. So, the point I really meant to make was that with a higher bomb-load and at a higher altitude, the B-29s would have laid waste to more of Germany.

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson