This is one of those read-it-somewhere-but-can't-remember-where things. I've read at least two authors theorizing that the British 3.7'' ack-ack gun would have made excellent anti-tank artillery in the same way that the 88 was used. The gun was available throughout the war but only used in mainland UK. I'm a bit vague on this one but it sounds an interesting might-have-been ?

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