Policies that worked in one war can fail when the starting conditions change. Britain entered the First World War after roughly forty years of uninterrupted capital-ship and cruiser construction, which left a large pool of modern vessels and made a pause defensible. By 1939, a twenty-year halt in capital-ship building and tight limits on carrier and cruiser construction had left the Royal Navy reliant on older hulls. Churchill nevertheless applied the same response. In this analysis, the resulting delays cost Britain more usable capital ships, carriers, and cruisers than wartime losses did.
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Churchill applies the wrong shipbuilding lesson
Britain paused major-warship construction in 1939 by reusing a First World War policy even though treaty limits and a twenty-year capital-ship gap had left a much older fleet.