Jamaica and Sheffield turn the Barents Sea battle

A major storm scatters JW 51B and confuses Force R's radar picture, leaving the cruisers about thirty miles north of the merchants when Admiral Hipper attacks. Captain Robert Sherbrooke's destroyers repeatedly threaten torpedo attacks despite being outgunned, convincing the German force that the escorts cannot be bullied aside and buying time for Jamaica and Sheffield to arrive. Hipper takes three six-inch hits, while two German destroyers mistake Sheffield for the heavy cruiser and try to form up on her. Sheffield sinks Friedrich Eckoldt at roughly two miles, and Jamaica engages Richard Beitzen. The British light cruisers then stand against Hipper and Lutzow in darkness until both sides turn away. Although the Royal Navy loses HMS Achates and HMS Bramble, every merchant ship reaches the Kola Inlet, making convoy survival the decisive measure of the action. The production imbalance shapes the cost of those losses: in the time Germany could commission five or six destroyers, Britain could add thirty to forty.