Dive-bomber evasion before stronger Tribal air defenses

The transition from Narvik to Bismarck includes a concise account of the class's early-war air-defense problem. Before a 4.7-inch mounting was replaced by twin 4-inch guns and other defenses improved, a Tribal destroyer often relied on maneuver to evade a dive bomber's release point. The helmsman had to judge the attack direction and turn away at the right instant. Captain Vian's flotilla leader Afridi survived repeated attacks but was eventually lost when one evasion failed, helping explain why Vian later transferred his flag to Cossack.