HMS Duncan's command spaces and flotilla role

Duncan was laid down in 1931 and commissioned in 1933, with a 3-inch high-angle gun placed between her funnels and a weapons fit otherwise close to that of the rest of the D-class. The leader's main distinction was space for the flotilla captain and command staff rather than a different battery. A captain commanded both the leader and the flotilla, whereas the other destroyers were generally commanded by commanders or sometimes lieutenant commanders. Her 36-knot speed and 5,870-nautical-mile cruising range continued the push for destroyers able to reach distant stations. Six of the eight regular D-class ships were lost, including one in a collision with HMS Barham, a reminder of a destroyer's physical vulnerability beside a battleship. Command accommodation, endurance, and fleet integration mattered as much as headline armament.