The Royal Navy was especially concerned about French heavy cruisers and the Dunkerque class falling into Axis hands. Their high-speed Atlantic reach could threaten Gibraltar, escape into ocean routes, and force Britain to divert scarce fast capital ships. Losing the two French ships also removed a large share of the Allies' available fast-capital-ship strength just as Hood and Repulse needed refits and King George V was only approaching service. In their original form, the Dunkerques appear more efficient and capable than the Scharnhorst class, making their uncertain allegiance a strategic problem rather than a symbolic one.
Notable Point · 55:35-59:06
Their usefulness made the Dunkerques dangerous after France fell
Britain feared the class precisely because its speed, endurance, and fighting power could become a serious German or Italian commerce-raiding asset.