Polybius, Histories

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Arrangements When There Are More Men

The number then of foot-soldiers and cavalry being

Provision for extra numbers.

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.

and for two consular armies.

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.