What minimum surface force would make a submarine-focused German navy more credible?
Short answerPairs of long-range, fast 11-inch-gun raiders would force cruisers to avoid them and disperse heavier British protection.
NotesA credible surface complement does not require Germany to reproduce a balanced battlefleet. The useful minimum is a continuing group of long-range, fast Panzerschiff-type raiders armed with 11-inch guns. Operating in pairs, they would be powerful enough that ordinary cruisers could not engage them casually. Their presence would force the Royal Navy to allocate heavier ships across trade routes and complicate an anti-submarine campaign already stretched by U-boats. The strategic value lies in dispersing the defender rather than winning a conventional fleet battle.