Beagle:
Once H2S was in service, by switching to the bombing of counterforce rather than countervalue targets.
For all the scientific aids that BC had at its disposal, it was from start to finish a very blunt instrument. The reason that it bombed cities was because it could find them at night, with luck. Crews survived an average of as little as 7 missions so the more experienced ones that beat that statistic led the others as Pathfinders using Oboe, H2S etc, to mark the target. Even so it was a crude but effective weapon, fit for smashing cities, de-housing and killing the population and hence disrupting war production. It meant at least that on D-Day the Allies could wade ashore unhindered by the Luftwaffe which would otherwise have made a closely run thing a disaster. It is very easy for us these days to suggest that they should have switched targeting, been more precise, been more effective. Harris knew that he had been given a club to wield. He used it as such.