Naval Historywith Dr. Alex

Q&A · 2:27:55-2:30:14

Royal Navy dual-purpose guns and the Dido role

The 4.5-inch gun is selected as the Royal Navy's strongest wartime dual-purpose weapon, followed by a correction to the common description of Dido-class cruisers as purpose-built anti-aircraft ships.

4.5-inch Guns5.25-inch Guns6-inch GunsAnti-Aircraft WarfareAtlanta Class CruisersDestroyer LeadersDido Class Light CruisersNaval GunsRoyal NavyWorld War II
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Question

What was the Royal Navy's best dual-purpose gun for surface and anti-aircraft duty in the Second World War?

Short answer

The 4.5-inch gun is preferred; the follow-up explains the Dido's 5.25-inch armament as a compromise for defending formations against destroyers until an automatic 6-inch mounting became available.

Notes

The 4.5-inch gun is the preferred Royal Navy dual-purpose weapon for the Second World War. The discussion then distinguishes Dido-class cruisers from ships designed solely for anti-aircraft service. Didos were intended to defend formations against enemy light forces, including destroyers, while the Atlanta class is identified as a destroyer-leader design. Henderson's preference for the 5.25-inch gun rested on the volume of fire it could deliver against a destroyer attack at the expected ranges. It was a compromise pending a better automatic 6-inch mounting. Its useful anti-aircraft capability was secondary to the destroyer-stopping requirement in this explanation.