‘Well, there they are.’ Macro scratched his chin as he squinted into the distance. The sun was low in the sky and his eyes watered as he made out the enemy. Two miles away a large party of horsemen were riding over a fold in the land. They reined in and seemed to be observing the fort in turn. ‘They won’t be able to do anything tonight.They’ll make camp, post pickets and get a good night’s rest.’

‘That sounds like wishful thinking, sir,’ Cato responded quietly. ‘If I’m any judge of the situation I’d say that Bannus will want to crush us as swiftly as possible.’

‘And why’s that?’

‘As far as he’s aware, we would have sent for help the moment we knew that he was making for the fort. If he’s going to rouse the rest of the province then he’ll need to offer them proof that Rome can be beaten. If he has to give up the attempt on Bushir, then I think his support will melt away quickly enough.’

‘But the chances are that there won’t be any help coming. Not from Longinus at least.’

‘Yes, but Bannus doesn’t know that, sir. As far as he’s concerned, he’s got six or seven days before a relief column turns up. That means he’s going to have to move fast to take the fort.’ Cato thought for a moment and continued. ‘He’ll be counting on the threat from Parthia to stop Longinus sending any overwhelming force in response to the situation here. Bannus will hope that with Bushir in his hands he can attract enough recruits to counter any troops that Longinus eventually sends his way.’

Macro looked at Cato. ‘How can you know all that?’

‘Just thinking it through from the enemy’s point of view, sir.’ Cato nodded to himself. ‘Seems to make sense. In which case I think we shouldn’t take any chances. Bannus may even make an attempt on the fort tonight.’

‘Let him try.’ Macro smiled as he thought of the ground that had been prepared around the fort. Any attempt by the enemy to reach the walls under cover of darkness was going to bring them right on to the obstacles that the cohort had prepared. He indulged himself for a moment, imagining the frustrating delays and injuries Bannus would have to endure. Then his expression hardened. ‘All the same, you may be right. I’ll have two centuries on the wall at a time.’

‘I think that would be prudent, sir,’ replied Cato. ‘There’s one other thing.’

‘Yes?’

‘That business about letting Postumus and Scrofa return to duty.’

‘We need every man who can hold a sword.’

‘Maybe, but I still don’t trust either of them. Those bastards are bound to betray us the moment our backs are turned.’