HKB
[Sidenote: The space round the quarters.]
The result of these arrangements is that the whole camp is a square, with streets and other constructions regularly planned like a town. Between the line of the tents and the agger there is an empty space of two hundred feet on every side of the square, which is turned to a great variety of uses. To begin with, it is exceedingly convenient for the marching in and out of the legions. For each division descends into this space by the via which passes its own quarters, and so avoids crowding and hustling each other, as they would if they were all collected on one road. Again, all cattle brought into the camp, as well as booty of all sorts taken from the enemy, are deposited in this space and securely guarded during the night-watches. But the most important use of this space is that, in night assaults, it secures the tents from the danger of being set on fire, and keeps the soldiers out of the range of the enemy’s missiles; or, if a few of them do carry so far, they are spent and cannot penetrate the tents.
[Sidenote: Provision for extra numbers,]
[Sidenote: and for two consular armies.]
+32.+ The number then of foot-soldiers and cavalry being given (at the rate, that is to say, of four thousand or of five thousand for each legion), and the length, depth, and number of the maniples being likewise known, as well as the breadth of the passages and roads, it becomes possible to calculate the area occupied by the camp and the length of the aggers. If on any occasion the number of allies, either those originally enrolled or those who joined subsequently, exceeds their due proportion, the difficulty is provided for in this way. To the overplus of allies who joined subsequent to the enrolment of the army are assigned the spaces on either side of the Praetorium, the market-place and Quaestorium being proportionally contracted. For the extra numbers of allies who joined originally an extra line of tents (forming thus another via) is put up parallel with the other tents of the socii, facing the agger on either side of the camp. But if all four legions and both Consuls are in the same camp, all we have to do is to imagine a second army, arranged back to back to the one already placed, in exactly the same spaces as the former, but side by side with it at the part where the picked men from the extraordinarii are stationed facing the rearward agger. In this case the shape of the camp becomes an oblong, the area double, and the length of the entire agger half as much again. This is the arrangement when both Consuls are within the same agger; but if they occupy two separate camps, the above arrangements hold good, except that the market-place is placed half way between the two camps.
[Sidenote: Guard duty.]