provinces, like the Trans-Siberian railway, were built first of all for military purposes. They made it easy to send troops and supplies to all parts of the empire. But they served a larger purpose in facilitating trade, in bringing remote regions into closer communication with one another and with Rome, and in developing a common way of living and of thinking throughout the world. In other words they helped to make the empire a unit. Even after the political bonds which held the Empire together had been relaxed, the roads were left. They made trade and travel possible. They furnished a ready means of communication between different parts of the world, and exerted a powerful influence in preserving for us the features of Roman civilization.[25] One reason why the Romans surpassed modern imperialist states in their use of this effective civilizing agency is the fact that they employed their legionaries and auxiliaries in times of peace in the construction of roads and other public works. The story of the Third Augustan Legion in Africa, as Reid outlines it in his _Roman Municipalities_, is illuminating.[26] This legion was stationed in Northern Africa for a century and a half or two centuries, and from the numerous inscriptions which the French have brought to light there we can see the beneficent results of its labors throughout the province. In addition to the roads which it built, and the chains of forts, which it constructed along the frontier, there were at least five large towns which owed their construction almost entirely to the soldiers of the Third Legion. They developed the town of Theveste and constructed all the public buildings in it. When the surrounding country became peaceful and prosperous, the legion moved on to a new outpost, always enlarging the sphere of Roman influence. This is the history of Timgad. At first it was a military post, established to check raids by nomad tribes through the mountains. The soldiers constructed temples, baths, and all the other public buildings needed in a Roman city, and by 100 A.D. its importance was recognized by its elevation to the proud position of a Roman colony. In all parts of the Empire we find inscriptions recording the building by the soldiers of roads, bridges, amphitheatres, aqueducts, and harbors. Whether soldiers in modern times could be used for such purposes is doubtful, but we can at least see in the use which the Romans made of their soldiers one reason for their success as empire-builders.