The limited value of .50-calibre cruiser air defence

Were the Town-class cruisers' .50-calibre machine guns useful for anti-aircraft defence?

Only marginally; they helped morale and might score a lucky hit, but aircraft could usually release their weapons before entering effective range.

The .50-calibre mounts gave crews the reassurance of firing back at attacking aircraft. A lucky hit remained possible. Their short range allowed an aircraft to release its weapons before the guns could reliably stop it. The ability to return fire therefore offered more psychological value than dependable protection against an attack.