On the morning of 31 May the German High Seas Fleet set out on its "northern enterprise." What the German Government meant by that phrase has never been revealed. It has been inferred that a concentration of naval and military force against Russia was planned to anticipate Brussilov's coming offensive, but there were no signs of that movement on land, and the Germans had enough to do with Verdun and their lines elsewhere in France without committing themselves to another adventure in Russia; while the idea of a raid on the shipping between England and Norway seems an inadequate explanation of the force sent out. On the other hand, if the design was to cripple the British Navy, the opportune moment had been lost, for the adverse balance against the German Fleet had been enormously increased since the war broke out. In the autumn of 1914 occasional breakdowns in the machinery of British super-Dreadnoughts, accidents like the torpedoing of the Audacious, and the inadequacy of dock-accommodation had made uneasy the minds of men who dwelt upon these contingencies and made no allowance for similar mishaps to the enemy. But even they were reassured when in April 1915 British construction far outstripped any German possibilities; and as time went on the race grew ever more unequal. It is true that France ceased to partake in the competition, leaving this silent struggle of the workshop and the dockyard to Great Britain; and the chance of a battle in the Baltic had to be abandoned because no Allied battleships could be relied upon to reinforce the North Sea Fleet. But Britain's margin was ample enough, and at the battle of Jutland her weight of metal was as two to one. The Germans, however, had advantages of their own, particularly in a delaying fuse which caused their shells to explode after penetrating the enemy's armour instead of before. Their capital ships were also better armoured, and rarely sank when struck by shells or torpedoes. This was also true of the British battleships, and none were sunk on either side except the old German Pommern; but the British battle-cruisers fared badly. The German marksmanship was also better during the earlier stages of the battle, though inferior later on; and they had in Von Scheer an admiral of conspicuous ability.