agesilaos wrote:The steady stream were in no fit state to fight and were thus useless. The Macedonians line was thinner than usual at eight deep rather than sixteen so they had plenty of room, The Persians also had room enough to deploy their effective troops.
This statement is partially incorrect.The Macedonian phalanx did not "usually" fight 16 deep, and I have seen no persuasive evidence that it did. The evidence of Polybius and of the three versions of the technical tactical manuals is quite definite that when the phalanx stood in 16 deep files, they were in 'open', or normal order with each man occupying 6 feet of frontage. Our sources are equally firm that fighting usually took place in 'close' order/pyknosis, with each man occupying 3 feet of frontage.
The manuals refer to two methods of achieving this, the traditional method going back to the hoplite phalanx of marching up the rear half-file into the intervals, or the later Hellenistic method of every second man stepping out and forward. In Alexander's day the half-file method was the most likely.
In either method, the result was to produce a depth of 8, whilst occupying the same frontage, but with each man now occupying 3 feet rather than 6 feet. This was the more "usual" depth, although other depths could and were occasionally used in special circumstances.At Issus we have the evidence of Callisthenes ( Alexander's official historian at the time), transmitted via Polybius, that Alexander's phalanx fought 8 deep, and this was most assuredly not "thinner than usual".
For further discussion, see the "Tactike theoriai - manuals or philosophy" thread.
As to the question of numbers of Persians, since these were in effect unknown, one can only gain a rough idea. Another way of "guesstimating" is from the size of the ground that we are told the Persians occupied. This would give them somewhere between, say, 25-50,000 men. In other words, broadly the same order of magnitude as Alexander's roughly 40,000 men. Numbers such as Arrian and Plutarch's 600,000, or Diodorus and Justin's 400,000, or Curtius' 250,000 are really quite fanciful, as has been pointed out early on in the thread ( see e.g. Paralus' post of Jan 2010, which contains a great deal of sense ).
Logistic reasons would also restrict Persian numbers ( or anyone else's for that matter) to an army of this order of magnitude.
I am a little skeptical of the 'rate of march' method of Engels and Agesilaos, if only because it does not take much account of the totally unknown number of non-combatants. ( Did the Persians restrict their numbers, as Philip of Macedon did? It does not appear so.) This would reduce the numbers of actual troops estimated by the 'rate of march' method. Servants etc often provided skirmishers/light troops armed with missile weapons ( bows, slings,javelins) in ancient armies, and almost certainly did so for the Persians at Issos.
On the subject of wagons, these generally required roads, and were also restricted to the slower speed of oxen, but of course could carry much more than a pack animal or mule cart. Armies could and did 'outmarch' wagons. A good example is provided in Xenophon's 'Anabasis', where Cyrus' army would typically march around 17-25 miles or so a day for 4 or 5 days, then halt for several days while the wagons of the 'market' which provided his logistics caught up.
There also seems to be some confusion regarding TV Westerns. "Rowdy Yates" ( played by Clint Eatwood) was in "Rawhide', a series about cattle driving, and it only ever had one wagon - the 'chuckwagon' or cook's wagon. "Wagon Train" is the western you want, with the wagons under Major Seth Adams (Ward Bond) and scout Flint McCullough ( Robert Horton) crossing the prairie.....
edited to include "Westerns" !