The Atlanta class concentrated eight twin 5-inch/38 mounts on a lightly protected cruiser hull intended to scout, screen, and lead destroyers. Its main difficulty in this assessment was the limited advantage over American destroyers carrying the same gun. Dido's 5.25-inch battery offered a clearer increase in surface firepower over British destroyer weapons. Atlanta had more guns, but its cruiser role exposed it to opponents for which the 5-inch/38 lacked the desired surface firepower. An earlier 5-inch/54 offered a possible alternative, provided it could be fitted to the cruiser in a useful mounting while remaining impractical for enough destroyers to preserve that distinction.
Chapter · 35:18-46:23
Why the Atlanta duplicated destroyer capability
Atlanta's sixteen 5-inch/38 guns supplied heavy air-defense fire, while their overlap with destroyer armament weakened the case for a separate screening cruiser.