 One approach to estimating the size of the Persian army has been to estimate how many men might feasibly have been accommodated within the Persian camp; this approach gives figures of between 70,000 and 120,000 men.Lazenby, for instance, by comparison with later Roman military camps, calculates the number of troops at 70,000, including 10,000 cavalry.Meanwhile, Connolly derives a number of 120,000 from the same-sized camp.