The example of Admiral Graf Spee shows why paper gun comparisons are not enough. Ajax, Achilles, and Exeter imposed tactical and operational risk through pressure and the possibility of torpedo attack. Once the raider entered Montevideo, heavier forces including Renown and carrier aviation could close the remaining exits. The cruisers succeeded by mission-killing a commerce raider inside a wider pursuit system, not by matching its guns ship for ship.
Chapter · 1:05:59-1:10:21
River Plate: deterrence without equal guns
British cruisers could constrain a stronger raider through numbers, torpedo threat, pursuit, and the prospect of reinforcements.