As I recall the German ordnance dept wanted to equip the PzIII with the 37mm gun simply because they had a lot of 37mm guns lying around. The field commanders however wanted the 50mm gun. A compromise was reached in that the tank was fitted with the 37mm but built to accomodate the larger 50mm should the need arise, which in retrospect was a wise decision.Originally Posted by discovery1
But of course, not only the 37mm but also the 50mm was quickly found to be inadequate on the Eastern Front.
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