Q&A: what were Renown's 4.5-inch guns for?

Were Renown's 4.5-inch guns primarily anti-aircraft weapons?

They were dual-purpose: designed to engage aircraft while also defending against destroyers, torpedo boats, and other small surface attackers.

The 4.5-inch mountings were dual-purpose weapons rather than a purely anti-aircraft battery. Aircraft were a central target, but the guns also gave Renown rapid fire against destroyers and torpedo boats. That surface role mattered in the Mediterranean and in constrained Far Eastern waters, where night or close-range attacks by small craft were considered plausible. The answer links the reconstruction's ammunition and fire-control investment to the ship's expected tactical environment.