Spare naval guns are suggested as a way to replace British Army artillery lost at Dunkirk. The objection is that naval artillery cannot simply transfer into land service. Long barrels and other adaptation problems prevent the stored weapons from becoming ready field artillery merely by handing them over.
Notable Point · 4:56:23-4:56:44
Why spare naval guns could not immediately rearm the Army
Stored naval guns offered tempting replacements after Dunkirk, but adapting them for field use presented practical obstacles.