Note 19 — GERMANICUS IN GERMANY

There were four gates to a Roman camp. Livy says so in express terms: "Ad quatuor portas exercitum instruxit, ut, signo dato, ex omnibus portubus eruptionem facerent." The several gates were the prætorian; the gate opposite to it, at the extremity of the camp, called the decuman; and two others, called the right and left principals, because they stood on the right and left sides of the camp, fronting the street called Principia.