Despite his years in north Africa, Ballista, like so many northerners, expected a desert to consist of miles of golden sand dunes, something like a larger version of the beaches of his childhood but without the sea. The desert here was nothing like that. There was sand, but the dominant feature was the multitude of rocks, sharp, hard rocks lurking to lame animals, and under the rocks were scorpions and snakes waiting to wound humans.
The caravan crept from well to well. It averaged probably little more than ten miles a day. Every day was the same as the last. In the saddle before sunrise, then man and beast sweating in the heat of the day. Every -mile or two a halt would have to be called as an animal went lame or lost its load. The silence was broken only by the footfall of the animals, the creak of leather and the occasional mechanical curse from the men.
The seemingly endless repetition of the days put Demetrius in mind of Sisyphus, punished in the underworld by having to roll a huge stone up a sharp incline every day only to see it bounce back down again. Ballista thought of Skoll the wolf who chases the tail of the sun. Maximus worried a lot about snakes.
On the sixth day a range of steep hills appeared in the distance ahead. They were almost there: Arete could be seen clearly from the crest of the hills. Ballista set off at a fast canter, ahead of the column. Maximus, Demetrius and a newly appointed standard-bearer, a Palmyrene who on joining the Roman army had taken the ludicrously Roman name of Romulus, spurred after him. The draco he held snapped and whistled in the air.
Ballista sat on his pale horse on the summit and looked down at the city of Arete. It was about a mile away, and 300 feet below him. From this vantage point he could see into the city and make out its chief features. His first appraisal was quite encouraging.
On the far side, to the east, at the bottom of what appeared a steep cliff, the Euphrates. It justified its reputation as one of the great rivers, one of the limes imperii, the limits of the empire. It was enormous, as big as the Rhine or the Danube. Like them, it did not run in just one course. There were several islands in it, a largish one quite near the town. Yet so broad was the Euphrates that there was no realistic chance of the enemy crossing it without amassing a huge number of boats or building a bridge. Either way would take time, could not be hidden and could be opposed.
To the north and south the city was bounded by ravines. The engineer in Ballista imagined the waters from the winter rains gouging them out from the weaknesses in the rock over millennia. The southern ravine was the shorter. It ran close to the walls, rising to the level of the plain some 300 yards beyond the town. There was a bit more of a gap between the walls and the lip of the northern ravine, although of only a few yards. This ravine split in two, one spur curling around the western wall of the town, the other disappearing off towards the hills to the north-west. For the majority of their course both ravines were at least Zoo yards across – just within the range of effective artillery fire.
The obvious line of attack was from the west. From the foot of the hills a flat dun-coloured plain ran to the city walls. Apart from scattered rocks, it had no natural features whatsoever.
Ballista studied the scene with a professional eye. From this distance the walls looked fine; tall, and in good condition. He could see five rectangular towers projecting from the southern and eastern walls, three in the northern, and no fewer than fourteen in the western. The walls facing the plain and the Euphrates boasted fortified gates, each with its own flanking towers. A group of men with donkeys was approaching the main gate, probably peasants bringing in produce from the villages to the north-west. Using them as a measure, Ballista estimated that the wall facing the plain was almost a thousand yards long. That meant an average distance between the projecting towers of about sixty-six yards. Although the towers towards the northern end clustered closer together, undermining the average, a careful look indicated that no two towers were as far as a hundred yards apart. This was all good. The projecting towers allowed defenders to aim missiles along as well as away from the walls. Most of the gap between the towers was within effective javelin range; all was within effective bowshot. An attacker approaching the wall would thus face missiles coming from three directions. The builders of the walls of Arete had concentrated their resources (towers took time and cost money) on what appeared to be the right place.
The only obvious problem was the necropolis. Tomb after tomb – at least five hundred of them, he roughly calculated, probably more, stretching out about half a mile from the western wall, halfway to the hills. And they were like the ones at Palmyra: tall, square stone-built towers. Each one provided cover from missiles fired from the walls of the town. Each one was a potential artillery platform for attackers. Together, they were a huge, ready-to-hand source of materials to build siege works. They were going to make his life very difficult, in more ways than one.
Ballista shifted his attention to inside the walls. Beyond the desert gate the main street of Arete ran straight, other streets opening off it at set intervals at exact ninety-degree angles. The arrangement of neat rectangular blocks covered the town, breaking down only in the south-east corner, where there was a jumble of twisting lanes. In the north-west corner Ballista could see an open area, probably the campus martius, the army parade ground that Turpio had mentioned.
Ballista scanned the town again, this time for what was not there: no theatre, no circus, no obvious agora and, above all, no citadel.
His appraisal was mixed. The open area and the neat Hippodamian plan of regular town blocks would facilitate the assembly and movement of defending troops. But if the enemy breached the walls, there was no second line of defence, nor any suitable buildings from which to improvise one, and the regularity of the city's layout would then help the attackers. So many men were going to die in Arete the following spring.
'The kyrios is thinking!' Demetrius's furious stage whisper cut into Ballista's thoughts. He turned in the saddle. Maximus and Romulus looked impassively through and beyond their commander. Demetrius had turned his horse across the path.
'Let her through, Demetrius.'
Bathshiba smiled at the Greek boy, who was obviously trying not to glower back. She drew her horse alongside the northerner's.
'So, you are thinking, is it worth it?' she asked.
'In a sense. But I imagine not in whatever sense you mean.'
'Is it worth it for a famous Roman general and northern warrior such as yourself to travel all this way to defend a fly-blown dump like this? That is what I mean. And a fly-blown dump full of luxurious, decadent Syrian effeminates.'
'My people tell a story – obviously in the few moments when we are not painting ourselves blue, getting drunk or killing each other – that one evening a strange man appeared before Asgard, the home of the gods, and offered to build a wall around it if the gods let him have Freyja, the beautiful goddess.'
'I am not sure that my father, or your wife, would appreciate your attempts at paying me compliments.'
Ballista laughed. 'I am sure they would not. And I am sure that you are not here just for my company.'
'No, my father wants your permission to send a messenger ahead so that our people are ready. His messenger can also tell the town councillors, so that they come to meet you at the gate.'