The optio nodded and strolled over to the native guide. He was a short man, thickset and clad in a rough woollen tunic and leggings. He was barefoot, and bare-headed and the length of leather tied loosely as a collar had chafed his skin and left a weeping red welt around his fat neck. The guide was a metalsmith and depended for his livelihood on the strength in his arms, not his legs, and had suffered even more than the armour-clad legionaries from the morning’s march. Although he had claimed to know the route to the farms scattered amid the marsh, Macro suspected that he had nearly lost the way on several occasions. The fact that his family were held hostage in a small cage in the Roman camp had been more than an adequate incentive for him to find the right trail again as speedily as possible. But now he looked spent, squatting on the ground, chest heaving for breath and looking longingly at the canteen his Roman guard was drinking from.

The man started with a small cry of alarm as Cordus poked him with the tip of his boot. With a cringe he looked over his shoulder, squinting up at the optio as Cordus gave a little jerk of the man’s lead and forced him to struggle to his feet.

Cordus spoke to him in the smattering of Celtic he had picked up in Camulodunum while the Second Legion had been quartered there the previous winter. Between Cordus’ accent and the native’s unfamiliarity with the dialect it took a while for the question to be understood, and then the guide was pointing down the track and gabbling away in his own tongue until Cordus snapped irritably at him, yanking the leather lead to cut off the man’s anxious stream of speech. He let the Briton drop down on to the ground and tossed the leash back to the legionary in charge of the guide before turning round and heading back to Macro.

‘Well?’

‘He reckons we should be there within the hour, sir.’

‘Shit . . .’ Macro mopped his brow as he tried to work out the timing. An hour there, say two hours looking over the small cluster of farms and then six hours’ march back to the fort. It would be dusk before they made it back - if they were lucky. Blundering about in the marsh after dark was a pretty dire prospect. Macro took a quick swig from his canteen and wearily rose to his feet.’Get ‘em up, Optio! We’re on the move again.’

There was a chorus of groans and angry muttering from all sides.

‘Shut your fuckin’ mouths!’ Cordus shouted, ‘or I will personally kick your teeth out the back of your arses! Up! Up!’