Why six-inch cruisers suited D-Day fire support

Which ships provided the most effective naval gunfire support on D-Day?

Six-inch cruisers were the most flexible fire-support ships because they could move quickly between strategic, on-call, and counter-surface missions.

D-Day fire support included strategic bombardment, on-call fire, and counter-surface work. Six-inch cruisers could shift rapidly among those demands, whereas battleship guns were especially valuable against major fixed targets but slower to reload. Claims about the first ship to fire remain disputed among the Orion, Roberts, and Belfast accounts.