Ptolemaic army of 1st century BC

[bachmat66]

Hello gents,
we are doing some research regarding the Ptolemaic army of the mid 1st century BC - especially so called Alexandrine War period - over at the Polish site historycy.org,
and I am looking for info on that period Ptolemaic army and also on the army that Mithradates of Pergamon brought Caesar to the Delta in 47BC.

we already have the so called Palestrina mosaic - some fragments accessible here http://en.wikipedia.org/wiki/Nile_mosaic_of_Palestrina
we are inferring that most Ptolemaic army was armed with pikes of Macedonian 'descent'. Also perhaps the Ptolemaic armies by Nick Sekunda could be of some use, I think?

also please some more info on the battle of the Nile please, because what I found was that 'Egyptians' put a stiff resistance but were overcome by the pila showers, as their pikes proved to be useless, and that the young king drowned in his shining thorax when his royal boat had sunk overloaded.
I found some old book which quoted Caesar-Mithradates army at 20000 strong versus the same number of Ptolemy warriors.
I have a internet translation of the Bellum Alexandrinum http://classics.mit.edu/Caesar/alexandrian.html
but haven't finished reading it yet
I looked ad the Adrian Goldsworthy's latest book 'Caesar' but his info there was more about the Cleopatra affair etc than the war itself..
thanks
Dario