Armament and armour expose Columbia's combat limits

The ships combined one eight-inch gun with lighter weapons, torpedo tubes, and a protected deck, but their armour resembled that of much smaller cruisers. Their displacement looked first class while their protection and fighting strength did not fit comfortably within the normal rating system. That mismatch makes the class easier to understand as a specialized commerce destroyer than as a balanced fleet cruiser. Speed offered an escape only if machinery was ready and the tactical situation allowed time to accelerate; an already-engaged Edgar-class cruiser could erase that theoretical advantage.