All the larger vessels on each side were provided with movable turtle-decks or shields as a protection against missiles hurled from above. The real danger from these, however, lay in the injury which might be done to the upright spirals or the extended wings, thereby crippling the manoeuvring power of the craft, or causing her to fall headlong to the ground. On this account war-vessels did not depend upon one pair of wings alone, but all were fitted with at least two pairs, and some—the biggest—with even three or four pairs. Spare wings were also held in readiness to be run out at any moment to take the place of those which might suffer. The soarers, as stated, began the actual fighting with the efforts of those on one side to get above the vessels opposed to them, and of the other to prevent them from doing so. While these craft were darting to and fro, chasing each other round, now shooting upwards, now diving to avoid a threatened collision, suddenly a shock was heard, as two of them met in mid-air, with consequences mutually disastrous. A moment or two later both vessels were falling towards the ground, though the course followed was in each case most erratic. Just previously they had met and remained for a brief space as though glued together; then they flew apart, and began whirling and whizzing round in seemingly mad fashion, like gigantic bluebottles which have singed their wings. As they pursued their eccentric, irresponsible flight, darting this way and that, now spinning round like humming-tops, now rushing through the air like stray rockets, dangerous alike to friends and foes, each left behind it a sort of ’trail,’ which wound round and about, marking its exact course. This ’trail’ consisted of the members of the crews who had jumped or been thrown off, and were now floating downwards in their parachute dresses. Occasionally there were conflicts in mid-air, as individual castaways from the two airships happened to be thrown one against another in their descent. But such incidents as these were but trifles in an aerial battle; and, since they exercised practically no effect in deciding its ultimate issue, attracted little general notice. The main struggle would have to be fought out between the larger craft when they came to close quarters—a state of things which Agrando was manoeuvring to bring about. Fumenta, however, by previous arrangement with Ivanta, was equally anxious to avoid close fighting just then. Accordingly, he was exercising every stratagem his lengthened experience could devise which might tempt his enemies to alter their close formation and draw them on to attack him in loose order. Agrando, moving slowly forward, sent out yet more boarders, armed with tridents and shields, in readiness for the attack, and these formed another curious feature in this strange battle-scene.