'Who are you?'

'Auxiliary horse!' Ajax called back, nudging his mount to continue advancing. He could sense the Roman's hesitation and the hurried exchange with the other two men. Any moment they would guess the truth.

'Karim!' Ajax shouted. 'Now!'

A word of command was barked and a faint hiss cut through the air as the arrows shot towards the three Romans in a shallow arc. The leader was struck in the chest, and his horse took an arrow in the neck, causing it to rear up and throw its rider. Another arrow struck one of the riders in the thigh and the other shafts went wide. The third Roman turned and instantly kicked his heels in, galloping towards the temple a few hundred paces away. His surviving comrade struggled to pull out the arrow, giving the archers time to string a second volley. This time he was struck in the chest and face and toppled from his saddle into the sand, sending up a small cloud of dust.

'Get that one!' Karim bellowed, pointing to the man leaning low over the neck of his mount as it galloped to safety. More arrows flew after him but the target was moving swiftly and the range lengthening. Karim drew his sword and spurred his horse forward to give chase.

'Leave him!' Ajax ordered. 'It's too late for that. We must ride!'

Reluctantly sheathing his sword, Karim ordered the archers to cease shooting and then the column broke into a gallop, making for the gap between the mountains and the farmland. As they rode, Ajax cast frequent glances towards the temple and saw that the enemy horseman had reached an outpost. He gesticulated anxiously as he made his report. The shrill note of a horn carried on the cool morning air, and then another. There was still a quarter of a mile to go before the desert opened out when Karim called to him and pointed towards the Nile. Two squadrons of enemy cavalry were racing out from the Roman lines, one heading towards Ajax and his men while the other angled out across the strip of desert, aiming to cut them off.

It took Ajax only an instant to see that they would not reach the gap in time and he raised his arm to halt his men. They stopped their beasts in a swirl of dust. Ajax glanced round. There was only one direction left to them now: north.

'Follow me!' He pulled savagely on the reins and wheeled his mount round before spurring it away from the trap being set for them by the two Roman squadrons. The rest of the gladiators and Arabs turned and raced after him, thundering across the sand, the sunlit cliffs to their left and the orange haze to their right, through which peered the gleaming gold curve of the sun, low on the horizon. Ajax leaned forward, feeling the mane of the horse whip his chin as it galloped, head extended. He felt a bitterness poison his heart at the prospect of being chased down and forced to fight or surrender. His Roman enemies would be sure to relate how he had abandoned his men and run for his life. The only way to avoid such an outcome was to escape and fight on. That was all that mattered now.

The second Roman squadron abandoned the bid to cut them off and turned to join the chase; sixty men against Ajax's twenty. There was no question of turning to fight, he realised. That would doom them to certain defeat. As they pounded along the arid ground beside the cliffs, Ajax saw a defile winding up into the hills to his left. If it led to the top of the rocky plateau, there was still a chance of cutting round the Romans and rejoining Prince Talmis. If not, then at least it would give him and his men a chance to fight on a narrow front and face their pursuers on more even terms.

He indicated the head of the defile and yelled to Karim, 'Over there!'

The party of horsemen headed towards the rising ground. A dusty track lay ahead and Ajax took this as a good sign. All tracks led somewhere and there was a good chance that there was a route out of the defile. Looking back over his shoulder he saw that the closer of the two enemy squadrons was no more than a third of a mile behind them, closer than it had been a moment earlier, he calculated grimly. The track wound up into the rocky ground and the sounds of hoofbeats echoed off the parched stone. Soon the bends in the route hid their pursuers from view and Ajax wondered if there might be a chance to branch off the track and lose them. However, there proved to be little opportunity for such a ruse as the only paths leading away were too narrow and steep for the horses.

Then, just over a mile into what had become a gorge, the track widened out into an open space, surrounded by towering cliffs and jumbles of boulders. Here and there Ajax could see small openings in the rock, like caves. The track seemed to end abruptly at the foot of a tall cliff. There was no sign of life. Nothing moved about them and a profound sense of stillness and foreboding seemed to fill the hot air trapped in the large natural arena.

'What is this place?' asked Karim. 'Those caves, they're not natural. Someone has cut them out of the rock. Look there.'

He pointed towards a larger entrance, half hidden behind a giant boulder. The shaded interior was framed by square-cut masonry, which was covered with small carved symbols, like the ones Ajax had seen cut into the temple. He edged his horse closer and peered into the tunnel. The walls had been painted and they stretched off into the shadows, out of sight. Before he could examine the cave any further, one of his men called out and pointed back down the track. Ajax and his party strained their ears and then they heard it, the clattering echo of hoofbeats.

'Karim! Take the archers and get up on that cliff!' He indicated a jumble of rocks that formed the last bend in the track. 'Wait until they draw level with you before you shoot.'

Karim nodded and hurriedly dismounted to take command of the Arabs. Ajax faced the rest of his men, all that remained of his followers from Crete. 'The track just beyond the cliff is narrow. We can hold it well enough. Every one of us is worth three good Romans any day, and it seems there are plenty of tombs to go round.' He gestured at the openings in the surrounding rocks and his comrades laughed. 'Let's make sure we fill 'em up with dead Romans.'

Ajax took up position in the middle of the track and his men formed up on either side in a close line of men and horses. They drew their swords and raised the shields they had taken from the men they had killed earlier. The sound of hoofbeats echoed off the jagged and tumbling faces of the rocks in a disorientating clatter and then Karim's voice added to the rising din.

'Here they come! Make ready!'

Ajax tightened the grip on his sword and clenched his thighs against the flanks of his mount. Then the first of the Romans appeared around the base of the cliff, the decurion commanding the squadron and the signifer. As soon as he caught sight of the waiting horsemen, less than a hundred paces away, he threw up his arm and reined in. The rest of the squadron drew up and then the decurion walked them forward as he shouted his commands for his men to make ready to charge. They readied their lances and hefted their shields up from their saddle horns, slipping their hands into the straps before taking the reins back into their left hands. Meanwhile, Ajax was watching Karim and his small party of archers as they notched their first arrows, extended their bow arms and then drew back the arrows, took aim and waited for the order to shoot. Karim was staring down from the cliff intently, marking the approach of the enemy, and as they drew abreast of his position he raised his arm, held it there for a moment, and then swept it down.

'Loose arrows!'

A handful of the Romans looked up and round at the sound of his voice, then the arrows struck home amid their ranks, plunging into horseflesh, glancing off shields and armour with loud raps, with one thudding home into the signifier's thigh, pinning it to his saddle. The Arabs immediately fitted more arrows to unleash on the Romans and the walls of rock echoed with the shrill whinnies of terrified horses, the cries of their riders and the impact of arrows. Ajax watched as several of the Romans writhed on the ground and the rest milled in confusion, trying to shelter themselves and their mounts from the arrows. It was time to strike, he decided, taking a deep breath.