The Great Western Road bombings is an issue I have found recurring over many years. I came to the conclusion that the hits on and around Great Western Road were not intentional targeting by the Luftwaffe. I'm pretty well persuaded that is was miss-targeting and the most convincing reason was, as suggested, the mistaken identification of the road for a water feature i.e. Clyde or canal.
At the time of the Clydebank blitz air attack, directional techniques were still relatively primitive and targetting was in large part a case of interpretation and guestimating on-the-job.
One of the reasons that 'Bomber' Harris, in charge of the RAF, opted for the mass carpeting bombing of German cities, including civilian areas, was that the techniques for more selective heavy bombing (especially night-time) of military or otherwise strategic targets were just not available at that stage.
Many revisionist historians, like the Nazi apologist Irving, like to refer to Hariss's tactics as unjustified 'terror-bombing'. I was not around at the time being subjected to the immediate and intense terror of the Nazis threatening to invade at any time; so I prefer not to expound latter-day easy moral judgements on people fighting for their survival.
Another example of the lack of precision is that the Nazis didn't actually 'mean' to start the blitz on London. Their incidental off-loading of bombs on the fringes of London was a case of an almost-lost lone bomber unloading his lot before scuttling off back home. Within 24 hrs the British retaliated with a revenge raid on Berlin. This enraged Hitler into a declaration to the Riechstag that he would serve like-for-like.
The inability to deliver precise night-time bombing was ultimately one of the biggest factors in the Nazis losing the Battle of Britain... and hence WW2. (this is why some conspiracy-leaning historians allege that Churchill's Government deliberately baited the Nazis into the self-defeating mass bombing tactics... just a pity about the British civilians in the way in places like Clydebank
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