(1) Possibly Xenophon himself.
Clearchus listened to the reasoning, and then he asked the messenger, "How large the country between the Tigris and the canal might be?" "A large district," he replied, "and in it are villages and cities numerous and large." Then it dawned upon them: the barbarians had sent the man with subtlety, in fear lest the Hellenes should cut the bridge and occupy the island territory, with the strong defences of the Tigris on the one side and of the canal on the other; supplying themselves with provisions from the country so included, large and rich as it was, with no lack of hands to till it; in addition to which, a harbour of refuge and asylum would be found for any one, who was minded to do the king a mischief.
After this they retired to rest in peace, not, however, neglecting to send a guard to occupy the bridge in spite of all, and there was no attack from any quarter whatsoever; nor did any of the enemy's people approach the bridges: so the guards were able to report next morning. But as soon as it was morning, they proceeded to cross the bridge, which consisted of thirty-seven vessels, and in so doing they used the utmost precaution possible; for reports were brought by some of the Hellenes with Tissaphernes that an attempt was to be made to attack them while crossing. All this turned out to be false, though it is true that while crossing they did catch sight of Glus watching, with some others, to see if they crossed the river; but as soon as he had satisfied himself on that point, he rode off and was gone.
From the river Tigris they advanced four stages—twenty parasangs—to the river Physcus, which is a hundred feet broad and spanned by a bridge.