How would a refitted HMS Renown fare against all three Deutschland-class cruisers?
Short answerRenown would probably use her superior speed and fire control to isolate and destroy them one at a time.
NotesRenown was fast enough to decide when and how the engagement developed. She could close, use her 15-inch guns against one cruiser, and then open the range before the German ships organized a combined response. Repeating that cycle would prevent the Deutschlands from using their numbers effectively. Early radar-directed fire would make the problem still worse for them at night. Nominal ship counts matter less than speed, engagement control, and the ability to concentrate fire.