A thousand feet above it they stopped and hung for a moment motionless in mid-air. Then the roar of a thousand shells exploding far up in the quaking sky answered the salutes from the sentinel ships, and then, still signalling farewells with their search-lights, the squadrons swept out into the ocean of darkness that loomed round the light-girdled realm of Aeria.


CHAPTER XXIII.
THE FIRST BLOW.

THE night of the 15th of May 2037 was passed in an agony of apprehension by nearly the whole of civilised humanity. The long threatened and universally feared thunder-cloud of war had at last loomed up over the serene horizon of peace in full view of the whole world.

Although the events of the last six years had to some extent prepared the minds of men for the impending disaster, now that the last hour of the long peace was really about to strike there were very, very few among the millions of non-combatants who were able to rise superior to the universal panic.

The ocean terrorism which had paralysed the commerce of the world five years and a half before, fearful as it had been, was, so far as the bulk of humanity was concerned, a terror of the unseen. Ships had gone out to sea and had vanished into the depths, leaving no trace behind them, but the hand that struck the blow had remained invisible.

Now, however, this same terror, magnified a thousandfold, was to come close up to the shores of lands whose inhabitants had never known what it was for man to raise his hand against his brother. To-morrow the sun would rise as usual, the earth would smile, the sea would dance, and the air grow bright and warm under his beams, yet air and earth and sea would be wholly strange to the eyes of men, for they would be invested with terrors hitherto only pictured by the fears of panic.