enough men to hold its own frontier without a single legion from outside, but will push on westward, swing round the Yazyges and swallow them whole, and press on Germany from the rear till we crush it between Dacia and Gaul and colonize it up to the Baltic."
"These are all wild dreams," Balbinus protested. "Come down to facts. How do you hold Dacia now? If what you say is true it is already nearly as well worth looting as Gaul and will soon be richer. How do you hold off all those desperate nomads of the north? You can't set up a cordon of legionaries shoulder to shoulder, over a thousand miles of frontier. You can't ditch, stockade and tower any such endless line of defense. You can't even have posts close together. How do you hold off the raiders?"
"The legions do it handily," said Proculus. "Hold them off and push them back too."
"You can't make me believe that," Balbinus objected. "A legion can't catch nomads any more than a sow can catch larks or a mud turtle can catch butterflies. The raiders must slip in between your posts and tear up the country. As it gets richer and more peaceful they will have more temptation. The first war elsewhere that calls off some of your outpost garrisons, you'll have a series of inroads and the whole province will go up in smoke."
