The discussion distinguishes a light-cruiser base from a base for light forces. A modern light cruiser probably adds little at Heligoland, although an older vessel remains conceivable. Targets too powerful for destroyer guns can be engaged by the fortress's heavier artillery, while destroyers handle craft within their own weight class. This division of labour preserves harbour space and avoids exposing a cruiser to surprise attack without weakening the island's layered defence.
Notable Point · 2:00:47-2:02:07
Why the fortress does not need modern light cruisers
Fortress guns and destroyers divide the local defensive tasks well enough that stationing a modern light cruiser at Heligoland adds little and exposes a scarcer ship.