But while a supreme navy suffices to protect an island empire, it does not suffice to defend continental states; and the importance of British sea-power was that it gave us and other oversea peoples the liberty to take as much or as little part as we chose in a war to defend states that were threatened on land. The existence of that facility did not determine the extent to which it might be used by ourselves or by allies. That would depend upon the size of the armies we raised and the labour we spent upon their equipment; and we might have restricted our expeditionary forces to the numbers we sent under Marlborough against Louis XIV or under Wellington against Napoleon. But we could not have sent any without the command of the sea; and the essence of that command is that, firstly, it prevented the enemy from using his armies to invade our shores, and, secondly, it enabled us to send whatever forces we liked to whatever sphere of operations was not commanded by the enemy's armies. Philip II had demonstrated once for all the emptiness of the invasion scare when he sent a superb military expedition, the Spanish Armada, across a sea which he did not command; and the efforts of German submarines failed to affect the transport of our own and our Allies' troops or seriously to impede their communications.
The command of the sea was, in fact, abandoned by the Germans when on 26 July 1914 their fleet was recalled from the Norwegian fiords; and the cruisers which the outbreak of war found beyond reach of German territorial waters were in turn and in time destroyed. One Dreadnought, the Goeben, and a light cruiser, the Breslau, escaped to play a chequered part in the war. Caught by its outbreak in the Mediterranean, they attempted to make the Straits, were headed off by the British, and gained Messina on 5 August. Evading the British Fleet under circumstances which were held to cast no reflection on the British commander, and with assistance which it was deemed impolitic to make public, they pursued their flight eastward, gallantly assaulted by the smaller and slower Gloucester off Cape Matapan, until they reached the Dardanelles and took the Turkish Government under their charge. Out in the Atlantic the swift Karlsruhe caused some anxiety till she was wrecked in the West Indies, and the Geier was interned at Honolulu by the United States. A few converted merchantmen also pursued a brief career as raiders: the Cap Trafalgar was disposed of in a spirited action by the converted Cunarder Carmania on 14 September off Brazil; the Kaiser Wilhelm der Grosse was sunk by the Highflyer off Cape Verde Islands on 27 August; and the Spreewald was captured in the North Atlantic by the Berwick on 12 September. For the rest, the German mercantile marine was interned in neutral ports or restricted to Baltic waters, and apart from Von Spee and the submarines the German flag disappeared from the seas.