The Norwegian campaign would test whether the rebuilt cruisers' high-angle 4.7-inch mounts and existing AA weapons performed as intended. A converted ship might support a Tribal flotilla or reinforce operations around Narvik. If the prewar modification worked in combat, destroyers could adopt an already tested solution. Modifying guns they already carried would then offer a faster route than fitting entirely new guns and mounts. These consequences depend on the experimental mounting proving successful.
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Testing the conversion's air defence in Norway
Success under Norwegian air attack could demonstrate the 4.7-inch modification and encourage its spread to destroyers.