Jan Mayen
It was Washington's desire to have a million men in Europe by the end of the year. However despite the first convoy getting through unnoticed, due to the diversionary attack on Ireland, they still had the Royal Navy to worry about. Within a week of the first convoys arrival British submarines were already moving into the Norwegian Sea in attempt to strike at the Allied convoys traveling to & from Sweden via the Denmark Strait. Both sides however had learned the effectiveness of submarines in naval warfare & the Royal Navy's prey was being well guarded by American, German, & Swedish cruisers & destroyers. Through the month of May British subs sunk 16 ships, 4 being warships, at the cost of 8 boats. Of these cargo ships however, nearly half were on their return voyage & of those that were loaded only one carried troops, costing the US 4963 of 5000 soldiers. Two others that were destroyed however carried did carry 20 of the valuable US tanks each. These numbers were deemed two low by members of the Admiralty in London however & so the British Home Fleet was ordered to cut the supply lines.
On July 16 the majority of Britain's Home Fleet, a total of 143 ships, set out from Scapa Flow for the Norwegian Sea. Such a great movement of warships couldn't be covered up even if there weren't several Allied spies working in Britain. Within a few hours Berlin, Washington, & Stockholm knew of the Home Fleets movements & order were quickly dispatched to the Allied Navies to intercept & destroy the British fleet. By that afternoon the German High Seas Fleet set out from Wilhelmshaven, the Swedish North Sea Squadron from Bergen, & the US's newly designated European Fleet from Namsos & Narvik. The combined allied fleet numbered 130 warships & was under the command of US Admiral William Sims. There had been some debate between Berlin & Washington over who would command their navies joint endeavor, however Sims had successfully commanded the Americans to victory in the Battle of the Flemish Cap & so Germany finally agreed to his command. For three days the two opposing fleets sailed unimpeded by each other towards the convoy lanes. On July 20 however they finally came across one another 60 miles south of the Swedish island Jan Mayen.
At 1425 the first shots were fired setting off the Battle of Jan Mayen. The British Home Fleet consisted of 16 vengeance battleships, 12 pre-vengeance battleships, 6 battlecruisers, 10 armored cruisers, 24 light cruisers, & 75 destroyers while the Allie Fleet's ranks were filled by 13 vengeance battleships, 12 pre-vengeance battleships, 3 pocket battleships, 2 battlecruisers, 12 armored cruisers, 20 light cruisers, & 68 destroyers. For the first half hour the fighting was mostly between the quicker cruisers, however by 1510 the battleships opened up & one of the largest naval battles in history was in full swing. For hours the two fleets engaged & maneuvered around one another filling the sea with blood & oil. Night falling upon the battlefield only added to the chaos that was ensuing. By 0330 the fighting was beginning to lull though with the final shot being fired at 0505. As dawn brought forth a new day the waters of the Norwegian Sea were littered with each sides wreckage & bodies & the Home Fleet was nowhere in sight. The Battle of Jan Mayen was over & the Allies maintained control over the Norwegian Sea though at a terrible cost. 1 vengeance battleship, 3 pre-vengeance battleships, 1 battlecruiser, 2 armored cruisers, 4 light cruisers, & 9 destroyers had been sunk & the majority of those still afloat had some amount of damage as well as 7106 dead & 891 wounded. British losses were equally high with 3 vengeance battleships, 1 pre-vengeance battleship, 2 battlecruisers, 2 armored cruisers, 6 light cruisers, & 11 destroyers & the majority of its remaining ships having sme damgae with 8004 dead, 929 wounded, & 111 captured.
Invincible blowing up after being struck by Allied shells