'Well, you have made certain that we will have every Shrike this side of the Nile upon us, the moment we take our first step beyond the pass,' I told Kratas and his ruffians, and I could not have pleased them more, had I promised them a shipload of beer and pretty girls.

  FROM THE CREST OF THE PASS WE looked back at the cool blue of the sea for the last time and then dropped down into that sweltering wilderness of rock and sand that stood between us and the Nile.

  As we moved forward, the heat came at us like a mortal enemy. It seemed to enter through our mouths and nostrils as we gasped for breath. It sucked the moisture from our bodies like a thief. It dried out our skin and cracked it until our lips burst open like over-ripe figs. The rocks beneath our feet were hot, as though fresh from the pot-maker's kiln, and they scalded and blistered our feet, even through the leather soles of our sandals. It was impossible to continue the march during the hottest hours of the day. We lay in the flimsy shade of the linen tents that Tiamat had provided, and panted like hunting dogs after the chase.

  When the sun sank towards the jagged rock horizon, we went on. The desert around us was charged with such a brooding nameless menace that even the high spirits of the Blue Crocodile Guards were subdued. The long slow column wound like a maimed adder through the black rock outcrops and tawny lion-coloured dunes, following the ancient road along which countless other travellers had passed before us.

  When night fell at last, the sky came alive with such a dazzle of stars and the desert was lit so brightly that, from my place at the head of the caravan, I could recognize the shape of Kratas at the tail, although two hundred paces separated us. We marched on for half the night before Tanus gave the order to fall out. Then he had us up before dawn and we marched on until the heat-mirage dissolved the rocky outcrops around us and made the horizon swim so that it seemed to be moulded from melting pitch.

  We saw no other sign of life, except that once a troop of dog-headed baboons barked at us from the cliffs of a stark rock tableland as we passed below them, and the vultures soared so high in the hot blue sky that they appeared to be but dust motes swirling in slow and deliberate circles high above us.

  When we rested in the middle of the day the whirlwinds pirouetted and swayed with the peculiar grace of dancing houris across the plains, and the cupful of water that was our ration seemed to turn to steam in my mouth.

  'Where are they?' Kratas growled angrily. 'By Seth's sweaty scrotum, I hope these little birds will soon puff up their courage and come in to roost.'

  Although they were all tough veterans and inured to hardship and discomfort, nerves and tempers were wearing thin. Good comrades and old friends began to snarl at each other for no reason, and bicker over the water ration.

  'Shufti is a cunning old dog,' I told Tanup. 'He will gather his forces and wait for us to come to him, rather than hurry to meet us. He will let us tire ourselves with the journey, and grow careless with our fatigue, before he strikes.'

  On the fifth day I knew that we were approaching the oasis of Gallala when I saw that the dark cliffs ahead of us were riddled with the caves of ancient tombs. Centuries ago, the oasis had supported a thriving city, but then an earthquake had shaken the hills and damaged the wells. The water had dwindled to a few seeping drops. Even though the wells had been dug deeper to reach the receding water, and the earthen steps reached down to where the surface of the water was always in shade, the city had died. The roofless walls stood forlorn in the silence, and lizards sunned themselves in the courtyards where rich merchants had once dallied with their harems.

  Our very first concern was to refill the water-skins. The voices of the men drawing water at the bottom of the well were distorted by the echoes in the deep shaft. While they were busy, Tanus and I made a swift tour of the ruined city. It was a lonely and melancholy place. In its centre was the dilapidated temple to the patron god of Gallala. The roof had fallen in and the walls were collapsing in places. It had but a single entrance through the crumbling gateway at the western end.

  'This will do admirably,' Tanus muttered as he strode across it, measuring it with his soldier's eye for fortification and ambuscade. When I questioned him on his intentions, he smiled and shook his head. 'Leave that part of it to me, -old friend. The fighting is my business.'

  As we stood at the centre of the temple I noticed the tracks of a troop of baboons in the dust at our feet, and I pointed them out to Tanus. "They must come to drink at the wells,' I told him.

  That evening when we sat around the small, smoky fires of dried donkey dung in the ancient temple, we heard the baboons again, the old bull apes barking a challenge in the hills that surrounded the ruined city. Their voices boomed back and forth along the cliffs, and I nodded at Tanus across the fire. 'Your friend, Shufti, has arrived at last. His scouts are in the hills up there watching us now. It is they who have alarmed the baboons.'

  'I hope you are right. My blackguards are close to mutiny. They know mis is all your idea, and if you are wrong, I might have to give them your head or your backside to appease them,' Tanus growled, and went to speak to Astes at the neighbouring cooking-fire.

  Swiftly a new mood infected the camp as they realized that the enemy was near. The scowls evaporated and the men grinned at each other in the firelight, as they surreptitiously tested the edges of the swords concealed beneath the sleeping-mats on which they sat. However, they were canny veterans and they went through the motions of normal caravan life, so as not to alert the watchers in the dark hills above us. At last we were all bundled on our mats, and the fires died down, but none of us slept. I could hear them coughing and fidgeting restlessly all around me in the dark. The long hours drew out, and through the open roof I watched the great constellations of the stars wheel in stately splendour overhead, but still the attack never came.

  Just before dawn, Tanus made his round of the sentries for the last time, and then, on his way back to his place beside the cooling ashes of last night's fire, he stopped by my mat for a moment and whispered, 'You and your friends the baboons, you deserve each other. All of you bark at shadows.'

  'The Shrikes are here. I can smell them. The hills are full of them,' I protested.

  'All you can smell is the promise of breakfast,' he grunted. He knows how I detest the suggestion that I am a glutton. Rather than reply to such callow humour, I went out into the darkness to relieve myself behind the nearest pfle of ruins.

  As I squatted there, a baboon barked again, the wild, booming cry shattering the preternatural silences of that last and darkest of the night-watches. I turned my head in that direction and heard, faint and faraway, the sound of metal strike rock, as though a nervous hand had dropped a dagger up there on the ridge, or a careless shield had brushed against a granite outcrop as an armed man hurried to take up his station before the dawn found him out.

  I smiled complacently to myself; there are few pleasures in my life compared to that of making Tanus eat his words. As I returned to my mat, I whispered to the men mat I passed, 'Be ready. They are here,' and I heard my warning passed on from mouth to sleepless mouth.

  Above me the stars began to fade away, and the dawn crept up on us as stealthily as a lioness stalking a herd of oryx. Then abruptly I heard a sentry on the west wall of the temple whistle, a liquid warble that might have been the cry of a nightjar except that we all knew better, and instantly a stir ran through the camp. It was checked by the low but urgent whispers of Kratas and his officers, 'Steady, the Blues! Remember your orders. Hold your positions!' and not a man stirred from his sleeping-mat.