Kestrel looked from the gates and back to the master's hut. Perhaps eight of Celibor's workers would arm and provide some resistance. He glanced at the two struggling with the valve and saw that they were now working as fast as they could.
'What of the devils?' he asked Phoebe quickly. 'Where are the ones bigger than the imps on the wall?'
'Benthon is quite conservative,' Phoebe said. 'He will use demons of as little power as he can. Perhaps the imps are all that they have under their spell.'
'Then help with the balloon,' Kestrel decided. 'I will aid in the defense to give us as much time as I can.'
Kestrel bolted to Celibor's hut and pushed two of the slower workers aside. He reached for one of the shields and grabbed the sword that was closest of the lot. The blade felt heavy and not balanced to his liking but there was no time to choose.
Swinging his arm back and forth in what he hoped were menacing arcs he advanced with Celibor and four others to meet the first of the attacking men-at-arms. Six of the wizards' men raised their shields to meet them. With a ringing clang, steel crashed onto steel. Kestrel lunged forward, trying to get around his opponent's guard, but the man who faced him was skillful and dodged nimbly to the side. The rest of the wizards' men moved quickly behind the first and spread to outflank Kestrel and Celibor on both sides.
Kestrel retreated a step backward and darted a look back to the gate, sucking in his breath at what he saw. Another dozen men poured through the opening, lancemen and archers who fanned out across the yard. The limp balloon that was to be passage over the border made an ideal target and in a heart beat three arrows pierced the hide as if it were paper. The sphere crumpled and sagged to the ground. The lancers ran to the ore heaps and glassworks, pushing all resistance in front of them into a disorganized retreat.
'Another balloon from the storage hut,' Kestrel shouted in desperation. 'Start the bellows while there is still a chance.' He tore his gaze away from the scrambling workmen at the shouts to his adversaries and barely ducked a swipe at his unprotected neck.
Kestrel retreated another two steps and stumbled backward over a fallen workman, trying to block out the growing sense of futility that hammered at his thoughts. He heard a crash behind him and then a clatter of metal. A hot blast of air roared from the anthanar and almost blistered the back of his head. Flames shot up from the glassworks. Globs of molten slag arced over the yard, starting small fires in the debris wherever they landed. One hit the stack of uninflated balloons, and Kestrel groaned. In a moment, their remaining means of escape burned along with the rest.
Kestrel looked around for Phoebe or Astron, but acrid smoke was beginning to obstruct his view. He saw one of the pylons fall and then a second. The huge lead sphere seemed to lumber from its pedestal and lurch his way. Kestrel staggered backward and felt the wall of Celibor's hut. The alchemist had dropped his sword and was on one knee begging for mercy, a trickle of deep red running from his forehead.
The smoke thickened. Kestrel took a deep breath, plunging into where it was densest, just missing another swipe at his side. The fumes hurt his eyes. He squinted into the dirty grayness, just barely able to make out the menacing forms pursuing him and the indistinct objects toward which he ran.
Kestrel staggered a dozen steps forward and burst back into clear air. Tears clouded his vision. He shook his head in surprise, trying to understand what he saw. Almost directly in front were Phoebe and Astron, standing in the gondola Celibor had planned to couple to the balloon. Frantically the two were waving their arms and beckoning him forward.
Kestrel took one step, puzzled. The gondola was made of straw. Soon it, too, would be in flame. It was better to run as best one could. But while he pondered, the box lurched in his direction, scraping along the ground. A shadow passed over Kestrel, and he looked up, astonished. The gondola lifted from the ground and started to climb over his head.
Stunned, Kestrel watched Astron reach out over the edge of the box while Phoebe held him by the waist.
'Grab my hand, mortal,' Kestrel heard Astron shout. 'This is no time for your stembrain to assume command.'
Kestrel nodded blankly. He raised his arm and felt a surprisingly strong grip about his wrist. Then, with a stab of pain in his shoulder, he was lifted clear of the ground, just as a man-at-arms made one last stab at his dangling feet.
Kestrel looked down at the foundry. With gathering speed, it seemed to move more and more rapidly away. He heard the ping of an arrowhead on metal and glanced skyward for a second time. There was no mistake about it. The gondola was tethered to a sphere of lead.
CHAPTER TEN
'What wizardry is this?' Kestrel said as he climbed into the basket. 'Balloons of lead cannot fly.'
'There was no other choice,' Astron said. 'The ones of animal hide were all rendered useless by the minions of the wizards.'
'It is not a matter of choice.' Kestrel shook his head, still slightly dazed by what had happened. He looked over the edge of the gondola and saw the foundry yard shrink into toylike smallness. To the north, the camps of the two armies began to take shape into recognizable forms. The green wetness of the border marsh faded into the dark shadows of the setting sun. The low hills that led to the mines of Procolon grew closer with each passing moment. The onshore breeze was pushing them in exactly the direction Kestrel wished them to go.
'It is not a matter of choice,' he repeated. 'The metal is too heavy to be borne aloft.'
'The calculations shown to me by the alchemist were most interesting,' Astron said. 'It seems that the force carrying a balloon aloft is proportional to its volume. The greater the size of the sphere, the more it can lift.'
'One need not study one of the five arts to understand such a fact,' Kestrel said. 'The key point is that the weight of the balloon itself must be included in the total.'
'And so it is,' Astron said. 'The mass of a balloon increases as the square of its radius while its volume and lifting power increase with the cube. Regardless of the density of the material, eventually there is a size large enough that it can be buoyed aloft.'
Kestrel watched Astron pause, and what might be a smile of pleasure crossed the demon's face.
'I was fascinated by the concept of the vacuum,' Astron continued. 'And once I understood the principles, it was easy to perform the calculation for the lead sphere to which you directed my attention. Not only was it large enough to carry the skeletal structure inside which gave it shape but, as you can see, the three of us as well. I connected the gondola harness and the bottles of emptiness as soon as I saw that it was the last balloon remaining.'
'It never was intended to be a balloon.' Kestrel started to protest again, but then he stopped. Of course, he understood finally. For him, or any other man for that matter, connecting the vacuum bottles to the lead sphere would never have occurred as a possibility. But Astron was not blinded by the obvious. The demon merely thought it fortunate that the great ball was large enough to carry the three of them. There really was nothing of the five arts involved at all. Kestrel let out a deep breath and looked groundward. They were safely away and soon would be visiting the archimage.
But as he scanned the scene, a twinkle of light near the foundry wall caught Kestrel's eye. The feeling of relief immediately vanished. He studied the dancing pattern until he was sure, a scowl deepening on his face all the while. He pointed the light out to the others, and Astron nodded in confirmation. The cloud of imps that had tracked them to Menthos still pursued their flight. The buzzing sprites would have to be dealt with immediately, or they would have gained only a little respite from the wizards' wrath.
'Perhaps a magic bottle.' Phoebe pointed at the trailing swarm. 'Others of my council have spoken of them frequently. They use them to confine the imps that they summon through the flame. If we can capture them all before any returns to report where we are, then we will be cleanly away.'
Kestrel stared out at the imps and pondered what Phoebe had said. His thoughts raced, pulling together the elements of another plan. 'I think the wizard is right,' he said after a moment. 'We certainly have nothing to aid us in this empty gondola. And there are so many that we must find a way to deal with all of them at once. Let us land
