Percival's scout-cruiser discussion covered reconnaissance, commerce warfare, destroyer support, carrier screening, and attacks on enemy communications. On this reading, the concept evolved toward a screening cruiser whose job extended beyond serving as a distant picket or warning post. It needed enough combat power to blunt an incoming light-force or air attack, yet remain affordable enough to expose and replace. Both Didos and Atlantas were principally screening cruisers under that definition, with anti-aircraft work as one important part of a wider mission.
Notable Point · 18:32-22:57
A screening cruiser had to blunt the attack
Screening meant more than early warning: the ship had to stand between the fleet and attacking aircraft, destroyers, or torpedo craft and inflict serious disruption.