Isn't the internet a wonderful thing!
This morning I had a look for WRG's £rd Edition army lists and found this -
http://www.wargaming.co/recreation/deta ... sbook2.pdfCompared with the DBA lists these give you a better idea of what an army is composed of and they also give guidelines as to percentages, what could be used with what and generally they are far more friendly.
76. PALMYRAN.
260 AD to 272 AD.
C-in-C mounted on horse as SHC, L, or as EHC, HC, HCm or LCm, JLS, Sh, @ 100 points. 1
PA standard to accompany C-in-C, @ 30 points. Up to 1
Sub-General mounted on horse as SHC, L, @ 50 points. Up to 2
Roman Sub-General mounted on horse as HC, JLS, Sh, @ 50 points. *1
Cataphracts "Regular B" SHC, L, @ 15 points. 19 to 48
Regular light cavalry "Regular C" LC, JLS, B, Sh, @ 10 points. Up to 12
Volunteer light cavalry "Irregular B" LC, _B, @ 5 points. Up to 20
Regular archers "Regular C" LMI or LI, B, @ 3 points. 20 to 48
Extra to give Sh to regular archers, @ 1 point. Any or all
Irregular archers "Irregular C" LI,- B, @ 2 points. Up to 30
Caravan guards "Irregular C" HCm, JLS, B, Sh, @ 13 points. Up to 10
Light bolt-shooter with "Regular C" crew of 2, @ 20 points. Up to 2
Roman cavalry "Regular C" HC, JLS, Sh, @ 10 points. *5 to 12
Roman Moorish cavalry "Regular C", LC, JLS, Sh, @ 8 points. Up to 6
Roman legionaries "Regular C" MI, HTW, JLS, Sh, @ 5 points. *24 to 56
Roman auxiliaries "Regular C" LMI, JLS, Sh, @ 4 points. *24 to 56
Border horse archers "Regular D" LC, B, @ 5 points. Up to 12
Arabs "Irregular D". Up to xh LCm, JLS or B, Sh, @ 4 points, rest LC, JLS, Sh, @ 6 points. Up to 30
Up to 18 regular command factors @ 10 points.
Up to 10 irregular command factors @ 25 points.
14
This list covers the whole period of Palmyran independence. Minimums marked * apply if any of the troops referred to as Roman are used. Wargamers refighting the battles between Zenobia and Aurelian should not use such troops, and their Roman opponents should not use SHC or any troops with bows. Romans should not use Arabs unless they have already won at least one previous battle. An unaccompanied Palmyran army fights best in open or gently rolling terrain. Its most effective tatic is a thundering cataphract charge shot in by massed archers. Beware of using so many ancillary troops as to deprive yourself of sufficient cataphracts or distract you from employing them properly. Romans are most useful in closer terrain. The reason they are classed as subordinate instead of allies is that Odenathus was formally appointed commander of Roman forces in the east by Gallienus. Roman legionaries can fight in wedge.Hope this is of use to you.
Warrington museum has been contacted re the square - but to be honest I still don't think you will be justified in having Palmarene infantry "fighting in square".